<?xml version="1.0" encoding="UTF-8"?><xml><records><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Filipe Grilo</style></author><author><style face="normal" font="default" size="100%">Chintan Shah</style></author><author><style face="normal" font="default" size="100%">Steffen KÃ¼hn</style></author><author><style face="normal" font="default" size="100%">René SteinbrÃ¼gge</style></author><author><style face="normal" font="default" size="100%">Keisuke Fujii</style></author><author><style face="normal" font="default" size="100%">José Marques</style></author><author><style face="normal" font="default" size="100%">Ming Feng Gu</style></author><author><style face="normal" font="default" size="100%">José Paulo Santos</style></author><author><style face="normal" font="default" size="100%">José R. Crespo López-Urrutia</style></author><author><style face="normal" font="default" size="100%">Amaro, Pedro</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Comprehensive Laboratory Measurements Resolving the {LMM} Dielectronic Recombination Satellite Lines in Ne-like Fe xvii Ions</style></title><secondary-title><style face="normal" font="default" size="100%">The Astrophysical Journal</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2021</style></year><pub-dates><date><style  face="normal" font="default" size="100%">jun</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://doi.org/10.3847%2F1538-4357%2Fabf737</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">2</style></number><publisher><style face="normal" font="default" size="100%">American Astronomical Society</style></publisher><volume><style face="normal" font="default" size="100%">913</style></volume><pages><style face="normal" font="default" size="100%">140</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">n/a</style></abstract><notes><style face="normal" font="default" size="100%">n/a</style></notes></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Krauth, Julian J</style></author><author><style face="normal" font="default" size="100%">Schuhmann, Karsten</style></author><author><style face="normal" font="default" size="100%">Ahmed, Marwan Abdou</style></author><author><style face="normal" font="default" size="100%">Amaro, Fernando D.</style></author><author><style face="normal" font="default" size="100%">Amaro, Pedro</style></author><author><style face="normal" font="default" size="100%">Biraben, François</style></author><author><style face="normal" font="default" size="100%">Chen, Tzu-Ling</style></author><author><style face="normal" font="default" size="100%">Covita, Daniel S.</style></author><author><style face="normal" font="default" size="100%">Dax, Andreas J</style></author><author><style face="normal" font="default" size="100%">Diepold, Marc</style></author><author><style face="normal" font="default" size="100%">Fernandes, Luis M. P.</style></author><author><style face="normal" font="default" size="100%">Franke, Beatrice</style></author><author><style face="normal" font="default" size="100%">Galtier, Sandrine</style></author><author><style face="normal" font="default" size="100%">Gouvea, Andrea L</style></author><author><style face="normal" font="default" size="100%">Johannes GÃ¶tzfried</style></author><author><style face="normal" font="default" size="100%">Graf, Thomas</style></author><author><style face="normal" font="default" size="100%">Theodor W. HÃ¤nsch</style></author><author><style face="normal" font="default" size="100%">Jens Hartmann</style></author><author><style face="normal" font="default" size="100%">Hildebrandt, Malte</style></author><author><style face="normal" font="default" size="100%">Indelicato, Paul</style></author><author><style face="normal" font="default" size="100%">Julien, Lucile</style></author><author><style face="normal" font="default" size="100%">Kirch, Klaus</style></author><author><style face="normal" font="default" size="100%">Knecht, Andreas</style></author><author><style face="normal" font="default" size="100%">Liu, Yi-Wei</style></author><author><style face="normal" font="default" size="100%">Machado, Jorge</style></author><author><style face="normal" font="default" size="100%">Monteiro, Cristina M. B.</style></author><author><style face="normal" font="default" size="100%">Mulhauser, Françoise</style></author><author><style face="normal" font="default" size="100%">Naar, Boris</style></author><author><style face="normal" font="default" size="100%">Nebel, Tobias</style></author><author><style face="normal" font="default" size="100%">Nez, François</style></author><author><style face="normal" font="default" size="100%">dos Santos, Joaquim M. F.</style></author><author><style face="normal" font="default" size="100%">José Paulo Santos</style></author><author><style face="normal" font="default" size="100%">Szabo, Csilla I</style></author><author><style face="normal" font="default" size="100%">Taqqu, David</style></author><author><style face="normal" font="default" size="100%">Veloso, João F. C. A.</style></author><author><style face="normal" font="default" size="100%">Jan Vogelsang</style></author><author><style face="normal" font="default" size="100%">Voss, Andreas</style></author><author><style face="normal" font="default" size="100%">Weichelt, Birgit</style></author><author><style face="normal" font="default" size="100%">Pohl, Randolf</style></author><author><style face="normal" font="default" size="100%">Antognini, Aldo</style></author><author><style face="normal" font="default" size="100%">Kottmann, Franz</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Measuring the $\upalpha$-particle charge radius with muonic helium-4 ions</style></title><secondary-title><style face="normal" font="default" size="100%">Nature</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2021</style></year><pub-dates><date><style  face="normal" font="default" size="100%">jan</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://doi.org/10.1038%2Fs41586-021-03183-1</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">7843</style></number><publisher><style face="normal" font="default" size="100%">Springer Science and Business Media {LLC}</style></publisher><volume><style face="normal" font="default" size="100%">589</style></volume><pages><style face="normal" font="default" size="100%">527–531</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">n/a</style></abstract><notes><style face="normal" font="default" size="100%">n/a</style></notes></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>6</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Alison Wain</style></author><author><style face="normal" font="default" size="100%">Diogo Castro</style></author><author><style face="normal" font="default" size="100%">Rollo, {Maria Fernanda}</style></author><author><style face="normal" font="default" size="100%">Frederico Nogueira</style></author><author><style face="normal" font="default" size="100%">Gon{\c c}alo Santos</style></author><author><style face="normal" font="default" size="100%">Filipe, {Maria da Gra{\c c}a}</style></author><author><style face="normal" font="default" size="100%">Tissot, Isabel</style></author><author><style face="normal" font="default" size="100%">Sampaio, {Jorge Miguel}</style></author><author><style face="normal" font="default" size="100%">Santos, {José Paulo}</style></author><author><style face="normal" font="default" size="100%">Manuel Lemos</style></author><author><style face="normal" font="default" size="100%">Marta Manso</style></author><author><style face="normal" font="default" size="100%">Matthias Tissot</style></author><author><style face="normal" font="default" size="100%">Guerra, Mauro</style></author><author><style face="normal" font="default" size="100%">Miles Oglethorpe</style></author><author><style face="normal" font="default" size="100%">Amaro, Pedro</style></author><author><style face="normal" font="default" size="100%">Pedro Pedroso</style></author><author><style face="normal" font="default" size="100%">Silva, Rui</style></author><author><style face="normal" font="default" size="100%">Pessanha, Sofia</style></author><author><style face="normal" font="default" size="100%">Silva, {Tiago A. N.}</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Cultura Material, Cultura Científica: Património Industrial para o Futuro</style></title></titles><dates><year><style  face="normal" font="default" size="100%">2021</style></year><pub-dates><date><style  face="normal" font="default" size="100%">dec</style></date></pub-dates></dates><publisher><style face="normal" font="default" size="100%">Faculdade de Ciências e Tecnologia, Universidade Nova de Lisboa</style></publisher><pub-location><style face="normal" font="default" size="100%">Portugal</style></pub-location><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Material, Culture, Scientific Culture: Industrial Heritage for the Future&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">&lt;p&gt;IH4Future (PTDC/FIS-aQM/30292/2017&lt;/p&gt;
</style></notes></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">M. Togawa</style></author><author><style face="normal" font="default" size="100%">S. KÃ¼hn</style></author><author><style face="normal" font="default" size="100%">C. Shah</style></author><author><style face="normal" font="default" size="100%">P Amaro</style></author><author><style face="normal" font="default" size="100%">R. SteinbrÃ¼gge</style></author><author><style face="normal" font="default" size="100%">J. Stierhof</style></author><author><style face="normal" font="default" size="100%">N. Hell</style></author><author><style face="normal" font="default" size="100%">M. Rosner</style></author><author><style face="normal" font="default" size="100%">K. Fujii</style></author><author><style face="normal" font="default" size="100%">M. Bissinger</style></author><author><style face="normal" font="default" size="100%">R. Ballhausen</style></author><author><style face="normal" font="default" size="100%">M. Hoesch</style></author><author><style face="normal" font="default" size="100%">J. Seltmann</style></author><author><style face="normal" font="default" size="100%">S. Park</style></author><author><style face="normal" font="default" size="100%">F. Grilo</style></author><author><style face="normal" font="default" size="100%">F. S. Porter</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author><author><style face="normal" font="default" size="100%">M. Chung</style></author><author><style face="normal" font="default" size="100%">T. StÃ¶hlker</style></author><author><style face="normal" font="default" size="100%">J. Wilms</style></author><author><style face="normal" font="default" size="100%">T. Pfeifer</style></author><author><style face="normal" font="default" size="100%">G. V. Brown</style></author><author><style face="normal" font="default" size="100%">M. A. Leutenegger</style></author><author><style face="normal" font="default" size="100%">S. Bernitt</style></author><author><style face="normal" font="default" size="100%">J. R. Crespo López-Urrutia</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Observation of strong two-electron–one-photon transitions in few-electron ions</style></title><secondary-title><style face="normal" font="default" size="100%">Physical Review A</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style  face="normal" font="default" size="100%">nov</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://doi.org/10.1103%2Fphysreva.102.052831</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">5</style></number><publisher><style face="normal" font="default" size="100%">American Physical Society ({APS})</style></publisher><volume><style face="normal" font="default" size="100%">102</style></volume><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">n/a</style></abstract><notes><style face="normal" font="default" size="100%">n/a</style></notes></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Ito, Y</style></author><author><style face="normal" font="default" size="100%">Tochio, T</style></author><author><style face="normal" font="default" size="100%">Yamashita, M</style></author><author><style face="normal" font="default" size="100%">Fukushima, S</style></author><author><style face="normal" font="default" size="100%">Vlaicu, A M</style></author><author><style face="normal" font="default" size="100%">J. P. Marques</style></author><author><style face="normal" font="default" size="100%">Sampaio, J M</style></author><author><style face="normal" font="default" size="100%">M Guerra</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author><author><style face="normal" font="default" size="100%">Syrocki, Ł</style></author><author><style face="normal" font="default" size="100%">Słabkowska, K</style></author><author><style face="normal" font="default" size="100%">E. WÈ©der</style></author><author><style face="normal" font="default" size="100%">Polasik, M.</style></author><author><style face="normal" font="default" size="100%">Rzadkiewicz, J.</style></author><author><style face="normal" font="default" size="100%">P. Indelicato</style></author><author><style face="normal" font="default" size="100%">Ménesguen, Y</style></author><author><style face="normal" font="default" size="100%">M.-Ch. Lépy</style></author><author><style face="normal" font="default" size="100%">F. Parente</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Structure of K$\upalpha$1,2- and K$\upbeta$1,3-emission x-ray spectra for Se, Y, and Zr</style></title><secondary-title><style face="normal" font="default" size="100%">Physical Review A</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style  face="normal" font="default" size="100%">nov</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://doi.org/10.1103%2Fphysreva.102.052820</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">5</style></number><publisher><style face="normal" font="default" size="100%">American Physical Society ({APS})</style></publisher><volume><style face="normal" font="default" size="100%">102</style></volume><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">n/a</style></abstract><notes><style face="normal" font="default" size="100%">n/a</style></notes></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Machado, Jorge</style></author><author><style face="normal" font="default" size="100%">Carvalho, {Patrícia M. S.}</style></author><author><style face="normal" font="default" size="100%">Ana Félix</style></author><author><style face="normal" font="default" size="100%">Delfin Doutel</style></author><author><style face="normal" font="default" size="100%">Santos, {José Paulo}</style></author><author><style face="normal" font="default" size="100%">Carvalho, {Maria Luísa}</style></author><author><style face="normal" font="default" size="100%">Pessanha, Sofia</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Accuracy improvement in XRF analysis for the quantification of elements ranging from tenths to thousands μg g-1in human tissues using different matrix reference materials</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Analytical Atomic Spectrometry</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2020</style></year><pub-dates><date><style  face="normal" font="default" size="100%">dec</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">12</style></number><publisher><style face="normal" font="default" size="100%">Royal Society of Chemistry</style></publisher><volume><style face="normal" font="default" size="100%">35</style></volume><pages><style face="normal" font="default" size="100%">2920–2927</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;In this work, we aim at achieving the most accurate quantitative determination of elements in human tissues by means of X-ray Fluorescence spectrometry using the external calibration approach. A calibration curve built using a set of certified reference materials (CRM) of animal tissue was compared with the one obtained with a set of CRMs of plants and leaves with lower atomic number Z but with correction of the matrix using the scattering peaks of the X-ray tube anode. Finally, a calibration curve combining the two sets of CRMs was built and the accuracy of the quantification using the three methods was compared and a more precise method of quantification was obtained. This improved approach was tested on five paired samples of normal and tumour human tissue. Despite the high heterogeneity of the samples, and given the improvement in accuracy of the measurements, significant differences were found in the elemental concentration of low-Z elements. This journal is&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">&lt;p&gt;UID/FIS/04559/2019 to LIBPhys-UNL from the FCT/MCTES/PIDDAC, Portugal. FCT contract No. PD/BD/128324/2017.&lt;/p&gt;
</style></notes></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Ménesguen, Y</style></author><author><style face="normal" font="default" size="100%">Lépy, {M. C.}</style></author><author><style face="normal" font="default" size="100%">Ito, Y</style></author><author><style face="normal" font="default" size="100%">Yamashita, M</style></author><author><style face="normal" font="default" size="100%">Fukushima, S</style></author><author><style face="normal" font="default" size="100%">Polasik, M.</style></author><author><style face="normal" font="default" size="100%">Słabkowska, K</style></author><author><style face="normal" font="default" size="100%">Syrocki</style></author><author><style face="normal" font="default" size="100%">E. Wȩder</style></author><author><style face="normal" font="default" size="100%">P. Indelicato</style></author><author><style face="normal" font="default" size="100%">Marques, {J. P.}</style></author><author><style face="normal" font="default" size="100%">Sampaio, {J. M.}</style></author><author><style face="normal" font="default" size="100%">M Guerra</style></author><author><style face="normal" font="default" size="100%">F. Parente</style></author><author><style face="normal" font="default" size="100%">Santos, {J. P.}</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Precise x-ray energies of gadolinium determined by a combined experimental and theoretical approach</style></title><secondary-title><style face="normal" font="default" size="100%">Journal Of Quantitative Spectroscopy &amp; Radiative Transfer</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Diagram line energies</style></keyword><keyword><style  face="normal" font="default" size="100%">Mass attenuation coefficients</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2019</style></year></dates><publisher><style face="normal" font="default" size="100%">PERGAMON-ELSEVIER SCIENCE LTD</style></publisher><volume><style face="normal" font="default" size="100%">236</style></volume><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;We combined different experimental techniques with a theoretical approach to determine a consistent set of diagram lines energies and binding energies. We propose an original approach consisting in determining the mass attenuation coefficients in an energy range covering the L-, M- and N- absorption edges, including a detailed evaluation of the associated uncertainties, to derive precisely the binding energies. We investigated the Lα, Lβ and M spectra of Gd with an independantly calibrated high-resolution anti-parallel double-crystal x-ray spectrometer. All the lines were identified and found in excellent agreement with the binding energies previously derived. Morever, we identified for the first time M5−O2, M4−O2,3 and M4−N2,3 diagram lines.&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">&lt;p&gt;info:eu-repo/grantAgreement/FCT/5876/147413/PT# info:eu-repo/grantAgreement/FCT/5876/147256/PT# This work was also supported by the National Science Centre , Poland under grant number 2017/25/B/ST2/00901.&lt;/p&gt;
</style></notes></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Ito, Y</style></author><author><style face="normal" font="default" size="100%">Tochio, T</style></author><author><style face="normal" font="default" size="100%">Yamashita, M</style></author><author><style face="normal" font="default" size="100%">Fukushima, S</style></author><author><style face="normal" font="default" size="100%">Vlaicu, A M</style></author><author><style face="normal" font="default" size="100%">Syrocki, Ł</style></author><author><style face="normal" font="default" size="100%">Słabkowska, K</style></author><author><style face="normal" font="default" size="100%">Weder, E</style></author><author><style face="normal" font="default" size="100%">Polasik, M.</style></author><author><style face="normal" font="default" size="100%">Sawicka, K</style></author><author><style face="normal" font="default" size="100%">P. Indelicato</style></author><author><style face="normal" font="default" size="100%">J. P. Marques</style></author><author><style face="normal" font="default" size="100%">Sampaio, J M</style></author><author><style face="normal" font="default" size="100%">M Guerra</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author><author><style face="normal" font="default" size="100%">F. Parente</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Structure of high-resolution &lt;math xmlns=&quot;http://www.w3.org/1998/Math/MathML&quot;&gt;&lt;mrow&gt;&lt;mi&gt;K&lt;/mi&gt;&lt;msub&gt;&lt;mi&gt;$\beta$&lt;/mi&gt;&lt;mrow&gt;&lt;mn&gt;1&lt;/mn&gt;&lt;mo&gt;,&lt;/mo&gt;&lt;mn&gt;3&lt;/mn&gt;&lt;/mrow&gt;&lt;/msub&gt;&lt;/mrow&gt;&lt;/math&gt; x-ray emission spectra for the elements from Ca to Ge</style></title><secondary-title><style face="normal" font="default" size="100%">Phys. Rev. A</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2018</style></year><pub-dates><date><style  face="normal" font="default" size="100%">may</style></date></pub-dates></dates><number><style face="normal" font="default" size="100%">5</style></number><volume><style face="normal" font="default" size="100%">97</style></volume><pages><style face="normal" font="default" size="100%">052505</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;n/a&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">&lt;p&gt;n/a&lt;/p&gt;
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We focus our analysis on how electron correlation, as well as the negative-energy spectrum, can affect the forbidden $E1M1$ decay rate. For this purpose, we include the electronic correlation via an effective local potential and within a single-configuration-state model. Due to its experimental interest, evaluations of decay rates are performed for berylliumlike xenon and uranium. We find that the negative-energy contribution can be neglected at the present level of accuracy in the evaluation of the decay rate. On the other hand, if contributions of electronic correlation are not carefully taken into account, it may change the lifetime of the metastable state by up to 20%. By performing a fully relativistic $jj$-coupling calculation, we find a decrease of the decay rate by two orders of magnitude compared to nonrelativistic $LS$-coupling calculations, for the selected heavy ions.&lt;/p&gt;
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</style></abstract><accession-num><style face="normal" font="default" size="100%">A3C3A57C-94F5-4464-9F24-13C659908068</style></accession-num><notes><style face="normal" font="default" size="100%">n/a</style></notes><custom3><style face="normal" font="default" size="100%">papers3://publication/uuid/7C5BEB7B-8C87-4B76-B469-478A2F13BC96</style></custom3><label><style face="normal" font="default" size="100%">r15895</style></label></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Safari, L</style></author><author><style face="normal" font="default" size="100%">P Amaro</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author><author><style face="normal" font="default" size="100%">F. Fratini</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Angular and polarization analysis for two-photon decay of &amp;lt;span class=&amp;quot;aps-inline-formula&amp;quot;&amp;gt;&amp;lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&amp;gt;&amp;lt;mrow&amp;gt;&amp;lt;mn&amp;gt;2&amp;lt;/mn&amp;gt;&amp;lt;mi&amp;gt;s&amp;lt;/mi&amp;gt;&amp;lt;/mrow&amp;gt;&amp;lt;/math&amp;gt;&amp;</style></title><secondary-title><style face="normal" font="default" size="100%">Physical Review A</style></secondary-title><short-title><style face="normal" font="default" size="100%">JPS_Articles PTDC_FIS_117606_2010</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2014</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Jul 29</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://link.aps.org/doi/10.1103/PhysRevA.90.014502</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">1</style></number><volume><style face="normal" font="default" size="100%">90</style></volume><pages><style face="normal" font="default" size="100%">014502</style></pages><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;The amplitude of two-photon transitions between hyperfine states in hydrogenlike ions is derived based on the relativistic Dirac equation and second-order perturbation theory. We study angular and linear polarization properties of the photon pair emitted in the decay of $2s$ states, where spin-flip and non-spin-flip transitions are highlighted. We pay particular attention to hydrogenlike uranium, since it is an ideal candidate for investigating relativistic and high-multipole effects, such as spin-flip transitions. Two types of emission patterns are identified: (i) non-spin-flip transitions are found to be characterized by an angular distribution of the type $W($\theta${})$\sim${}1+{cos}^{2}$\theta${}$ while the polarizations of the emitted photons are parallel; and (ii) spin-flip transitions have somewhat smaller decay rates and are found to be characterized by an angular distribution of the type $W($\theta${})$\sim${}1$-${}1/3{cos}^{2}$\theta${}$ while the polarizations of the emitted photons are orthogonal, where $$\theta${}$ is the angle between photons directions. Deviations due to nondipole and relativistic contributions are evaluated for both types of transitions. This work is the first step toward exploring the effect of the nucleus over the angular and polarization properties of the photon pairs emitted by two-photon transitions.&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">n/a</style></notes><custom3><style face="normal" font="default" size="100%">papers3://publication/uuid/E09C92E7-D990-4F7E-A4AC-6A0AA3EA395F</style></custom3><label><style face="normal" font="default" size="100%">r13968</style></label></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Safari, L</style></author><author><style face="normal" font="default" size="100%">P Amaro</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author><author><style face="normal" font="default" size="100%">F. Fratini</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Angular and polarization analysis for two-photon decay of &amp;lt;span class=&amp;quot;aps-inline-formula&amp;quot;&amp;gt;&amp;lt;math xmlns=&amp;quot;http://www.w3.org/1998/Math/MathML&amp;quot;&amp;gt;&amp;lt;mrow&amp;gt;&amp;lt;mn&amp;gt;2&amp;lt;/mn&amp;gt;&amp;lt;mi&amp;gt;s&amp;lt;/mi&amp;gt;&amp;lt;/mrow&amp;gt;&amp;lt;/math&amp;gt;&amp;</style></title><secondary-title><style face="normal" font="default" size="100%">Physical Review A</style></secondary-title><short-title><style face="normal" font="default" size="100%">JPS_Articles PTDC_FIS_117606_2010</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2014</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Jul 29</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://link.aps.org/doi/10.1103/PhysRevA.90.014502</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">1</style></number><volume><style face="normal" font="default" size="100%">90</style></volume><pages><style face="normal" font="default" size="100%">014502</style></pages><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;The amplitude of two-photon transitions between hyperfine states in hydrogenlike ions is derived based on the relativistic Dirac equation and second-order perturbation theory. We study angular and linear polarization properties of the photon pair emitted in the decay of $2s$ states, where spin-flip and non-spin-flip transitions are highlighted. We pay particular attention to hydrogenlike uranium, since it is an ideal candidate for investigating relativistic and high-multipole effects, such as spin-flip transitions. Two types of emission patterns are identified: (i) non-spin-flip transitions are found to be characterized by an angular distribution of the type $W($\theta${})$\sim${}1+{cos}^{2}$\theta${}$ while the polarizations of the emitted photons are parallel; and (ii) spin-flip transitions have somewhat smaller decay rates and are found to be characterized by an angular distribution of the type $W($\theta${})$\sim${}1$-${}1/3{cos}^{2}$\theta${}$ while the polarizations of the emitted photons are orthogonal, where $$\theta${}$ is the angle between photons directions. Deviations due to nondipole and relativistic contributions are evaluated for both types of transitions. This work is the first step toward exploring the effect of the nucleus over the angular and polarization properties of the photon pairs emitted by two-photon transitions.&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">n/a</style></notes><custom3><style face="normal" font="default" size="100%">papers3://publication/uuid/E09C92E7-D990-4F7E-A4AC-6A0AA3EA395F</style></custom3><label><style face="normal" font="default" size="100%">r13968</style></label></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">F. Fratini</style></author><author><style face="normal" font="default" size="100%">Safari, L</style></author><author><style face="normal" font="default" size="100%">Hayrapetyan, A G</style></author><author><style face="normal" font="default" size="100%">Jankala, K</style></author><author><style face="normal" font="default" size="100%">P Amaro</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Quantized form factor shift in the presence of free electron laser radiation</style></title><secondary-title><style face="normal" font="default" size="100%">EPL (Europhysics Letters)</style></secondary-title><short-title><style face="normal" font="default" size="100%">JPS_Articles PTDC_FIS_117606_2010</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2014</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Jul 01</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://iopscience.iop.org/0295-5075/107/1/13002/article/</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">1</style></number><publisher><style face="normal" font="default" size="100%">IOP Publishing</style></publisher><volume><style face="normal" font="default" size="100%">107</style></volume><pages><style face="normal" font="default" size="100%">13002</style></pages><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;In electron scattering, the target form factors contribute significantly to the diffraction pattern and carry information on the target electromagnetic charge distribution. Here we show that the presence of electromagnetic radiation, as intense as currently available in free electron lasers, shifts the dependence of the target form factors by a quantity that depends on the number of photons absorbed or emitted by the electron as well as on the parameters of the electromagnetic radiation. As example, we show the impact of intense ultraviolet and soft X-ray radiation on elastic electron scattering by the Ne-like argon ion and by the xenon atom. We find that the shift brought by the radiation to the form factor is of the order of some percent. Our results may open up a new avenue to explore matter with the assistance of laser.&lt;/p&gt;
</style></abstract><accession-num><style face="normal" font="default" size="100%">08F8A7AB-4557-474A-95F4-424776CC4782</style></accession-num><notes><style face="normal" font="default" size="100%">n/a</style></notes><custom3><style face="normal" font="default" size="100%">papers3://publication/uuid/E394D1CF-E047-49AD-BD41-7879BEF5D185</style></custom3><label><style face="normal" font="default" size="100%">r13276</style></label></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">F. Fratini</style></author><author><style face="normal" font="default" size="100%">Safari, L</style></author><author><style face="normal" font="default" size="100%">Hayrapetyan, A G</style></author><author><style face="normal" font="default" size="100%">Jankala, K</style></author><author><style face="normal" font="default" size="100%">P Amaro</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Quantized form factor shift in the presence of free electron laser radiation</style></title><secondary-title><style face="normal" font="default" size="100%">EPL (Europhysics Letters)</style></secondary-title><short-title><style face="normal" font="default" size="100%">JPS_Articles PTDC_FIS_117606_2010</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2014</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Jul 01</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://iopscience.iop.org/0295-5075/107/1/13002/article/</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">1</style></number><publisher><style face="normal" font="default" size="100%">IOP Publishing</style></publisher><volume><style face="normal" font="default" size="100%">107</style></volume><pages><style face="normal" font="default" size="100%">13002</style></pages><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;In electron scattering, the target form factors contribute significantly to the diffraction pattern and carry information on the target electromagnetic charge distribution. Here we show that the presence of electromagnetic radiation, as intense as currently available in free electron lasers, shifts the dependence of the target form factors by a quantity that depends on the number of photons absorbed or emitted by the electron as well as on the parameters of the electromagnetic radiation. As example, we show the impact of intense ultraviolet and soft X-ray radiation on elastic electron scattering by the Ne-like argon ion and by the xenon atom. We find that the shift brought by the radiation to the form factor is of the order of some percent. Our results may open up a new avenue to explore matter with the assistance of laser.&lt;/p&gt;
</style></abstract><accession-num><style face="normal" font="default" size="100%">08F8A7AB-4557-474A-95F4-424776CC4782</style></accession-num><notes><style face="normal" font="default" size="100%">n/a</style></notes><custom3><style face="normal" font="default" size="100%">papers3://publication/uuid/E394D1CF-E047-49AD-BD41-7879BEF5D185</style></custom3><label><style face="normal" font="default" size="100%">r13276</style></label></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Santos, S. C. P. L.</style></author><author><style face="normal" font="default" size="100%">Cruz, M. E.</style></author><author><style face="normal" font="default" size="100%">Barroso, A. M. E.</style></author><author><style face="normal" font="default" size="100%">Fonseca, C. P. S.</style></author><author><style face="normal" font="default" size="100%">M Guerra</style></author><author><style face="normal" font="default" size="100%">M. L. Carvalho</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Elemental characterization of plants and soils in Panasqueira tungsten mining region</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Soils Sediments</style></secondary-title><short-title><style face="normal" font="default" size="100%">JPS_Articles PTDC_2014</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2014</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://link.springer.com/article/10.1007/s11368-013-0788-x</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">14</style></volume><pages><style face="normal" font="default" size="100%">778</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;... Title Elemental characterization of plants and soils in Panasqueira tungsten mining region Journal Journal of Soils and Sediments Volume 14, Issue 4 , pp 778-784 Cover Date 2014-04-01 DOI 10.1007 / s11368 - 013 - 0788 - x Print ISSN 1439-0108 Online ISSN 1614-7480 ... &lt;/p&gt;
</style></abstract><accession-num><style face="normal" font="default" size="100%">4285438803801704978related:EopGB-PveDsJ</style></accession-num><notes><style face="normal" font="default" size="100%">n/a</style></notes><custom3><style face="normal" font="default" size="100%">papers3://publication/uuid/9D7BDE6B-E109-4583-BC3C-B1C92FE59F73</style></custom3><label><style face="normal" font="default" size="100%">r05752</style></label></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Santos, S. C. P. L.</style></author><author><style face="normal" font="default" size="100%">Cruz, M. E.</style></author><author><style face="normal" font="default" size="100%">Barroso, A. M. E.</style></author><author><style face="normal" font="default" size="100%">Fonseca, C. P. S.</style></author><author><style face="normal" font="default" size="100%">M Guerra</style></author><author><style face="normal" font="default" size="100%">M. L. Carvalho</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Elemental characterization of plants and soils in Panasqueira tungsten mining region</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Soils Sediments</style></secondary-title><short-title><style face="normal" font="default" size="100%">JPS_Articles PTDC_2014 </style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2014</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://link.springer.com/article/10.1007/s11368-013-0788-x</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">14</style></volume><pages><style face="normal" font="default" size="100%">778</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;... Title Elemental characterization of plants and soils in Panasqueira tungsten mining region Journal Journal of Soils and Sediments Volume 14, Issue 4 , pp 778-784 Cover Date 2014-04-01 DOI 10.1007 / s11368 - 013 - 0788 - x Print ISSN 1439-0108 Online ISSN 1614-7480 ... &lt;/p&gt;
</style></abstract><accession-num><style face="normal" font="default" size="100%">4285438803801704978related:EopGB-PveDsJ</style></accession-num><notes><style face="normal" font="default" size="100%">n/a</style></notes><custom3><style face="normal" font="default" size="100%">papers3://publication/uuid/9D7BDE6B-E109-4583-BC3C-B1C92FE59F73</style></custom3><label><style face="normal" font="default" size="100%">r05752</style></label></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Pé-Leve Santos, Sara C</style></author><author><style face="normal" font="default" size="100%">Cruz, Mariana Eloy</style></author><author><style face="normal" font="default" size="100%">Barroso, António M E</style></author><author><style face="normal" font="default" size="100%">Fonseca, Catarina P S</style></author><author><style face="normal" font="default" size="100%">Guerra, Mauro</style></author><author><style face="normal" font="default" size="100%">Carvalho, Maria Luisa</style></author><author><style face="normal" font="default" size="100%">Santos, Jose Paulo</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Elemental characterization of plants and soils in Panasqueira tungsten mining region</style></title></titles><dates><year><style  face="normal" font="default" size="100%">2013</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Oct 16</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://link.springer.com/10.1007/s11368-013-0788-x</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">Online</style></volume><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">n/a</style></abstract><notes><style face="normal" font="default" size="100%">n/a</style></notes><custom3><style face="normal" font="default" size="100%">papers2://publication/uuid/9D7BDE6B-E109-4583-BC3C-B1C92FE59F73</style></custom3><label><style face="normal" font="default" size="100%">r35783</style></label></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">P Amaro</style></author><author><style face="normal" font="default" size="100%">F. Fratini</style></author><author><style face="normal" font="default" size="100%">S. Fritzsche</style></author><author><style face="normal" font="default" size="100%">P. Indelicato</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author><author><style face="normal" font="default" size="100%">A. Surzhykov</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Parametrization of the angular correlation and degree of linear polarization in two-photon decays of hydrogenlike ions</style></title><secondary-title><style face="normal" font="default" size="100%">Phys. Rev. A</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2012</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Oct</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://link.aps.org/doi/10.1103/PhysRevA.86.042509</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">86</style></volume><pages><style face="normal" font="default" size="100%">042509</style></pages><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;The spontaneous two-photon emission in hydrogenlike ions is investigated within the framework of second- order perturbation theory and Dirac’s equation. Special attention is paid to the angular correlation of the emitted photons as well as to the degree of linear polarization of one of the two photons, if the second is just observed under arbitrary angles. Expressions for the angular correlation and the degree of linear polarization are expanded in powers of cosine functions of the two-photon opening angle, whose coefficients depend on the atomic number and the energy sharing of the emitted photons. The effects of including higher (electric and magnetic) multipoles upon the emitted photon pairs beyond the electric-dipole approximation are also discussed. Calculations of the coefficients are performed for the transitions 2s1/2 → 1s1/2, 3d3/2 → 1s1/2, and 3d5/2 → 1s1/2, along the entire hydrogen isoelectronic sequence (1 &lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">&lt;p&gt;PTDC/FIS/117606/2010 &lt;/p&gt;
</style></notes><custom3><style face="normal" font="default" size="100%">papers2://publication/uuid/7CF5A784-7D6C-4B71-A02F-85FAAD40FC0F</style></custom3><label><style face="normal" font="default" size="100%">r25554</style></label></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">P Amaro</style></author><author><style face="normal" font="default" size="100%">F. Fratini</style></author><author><style face="normal" font="default" size="100%">S. Fritzsche</style></author><author><style face="normal" font="default" size="100%">P. Indelicato</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author><author><style face="normal" font="default" size="100%">A. Surzhykov</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Parametrization of the angular correlation and degree of linear polarization in two-photon decays of hydrogenlike ions</style></title><secondary-title><style face="normal" font="default" size="100%">Physical Review A</style></secondary-title><short-title><style face="normal" font="default" size="100%">JPS_Articles PTDC_FIS_117606_2010 </style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2012</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Oct</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://link.aps.org/doi/10.1103/PhysRevA.86.042509</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">86</style></volume><pages><style face="normal" font="default" size="100%">042509</style></pages><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;The spontaneous two-photon emission in hydrogenlike ions is investigated within the framework of second- order perturbation theory and Dirac’s equation. Special attention is paid to the angular correlation of the emitted photons as well as to the degree of linear polarization of one of the two photons, if the second is just observed under arbitrary angles. Expressions for the angular correlation and the degree of linear polarization are expanded in powers of cosine functions of the two-photon opening angle, whose coefficients depend on the atomic number and the energy sharing of the emitted photons. The effects of including higher (electric and magnetic) multipoles upon the emitted photon pairs beyond the electric-dipole approximation are also discussed. Calculations of the coefficients are performed for the transitions 2s1/2 → 1s1/2, 3d3/2 → 1s1/2, and 3d5/2 → 1s1/2, along the entire hydrogen isoelectronic sequence (1  Z  100).&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">&lt;p&gt;PTDC/FIS/117606/2010 &lt;/p&gt;
</style></notes><custom3><style face="normal" font="default" size="100%">papers3://publication/uuid/7CF5A784-7D6C-4B71-A02F-85FAAD40FC0F</style></custom3><label><style face="normal" font="default" size="100%">r04747</style></label></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Safari, L</style></author><author><style face="normal" font="default" size="100%">P Amaro</style></author><author><style face="normal" font="default" size="100%">S. Fritzsche</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author><author><style face="normal" font="default" size="100%">Tashenov, S</style></author><author><style face="normal" font="default" size="100%">F. Fratini</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Relativistic polarization analysis of Rayleigh scattering by atomic hydrogen</style></title><secondary-title><style face="normal" font="default" size="100%">Phys. Rev. A</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2012</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Oct</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://link.aps.org/doi/10.1103/PhysRevA.86.043405</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">86</style></volume><pages><style face="normal" font="default" size="100%">043405</style></pages><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;A relativistic analysis of the polarization properties of light elastically scattered by atomic hydrogen is performed, based on the Dirac equation and second-order perturbation theory. The relativistic atomic states used for the calculations are obtained by making use of the finite basis set method and are expressed in terms of B splines and B polynomials. We introduce two experimental scenarios in which the light is circularly and linearly polarized, respectively. For each of these scenarios, the polarization-dependent angular distribution and the degrees of circular and linear polarization of the scattered light are investigated as a function of scattering angle and photon energy. Analytical expressions are derived for the polarization-dependent angular distribution which can be used for scattering by both hydrogenic as well as many-electron systems. Detailed computations are performed for Rayleigh scattering by atomic hydrogen within the incident photon energy range 0.5 to 5 keV. Particular attention is paid to the effects that arise from higher (nondipole) terms in the expansion of the electron-photon interaction.&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">&lt;p&gt;PTDC/FIS/117606/2010 &lt;/p&gt;
</style></notes><custom3><style face="normal" font="default" size="100%">papers2://publication/uuid/77891F9F-8A24-44A5-98B0-5053CE3A4F26</style></custom3><label><style face="normal" font="default" size="100%">r25555</style></label></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Safari, L</style></author><author><style face="normal" font="default" size="100%">P Amaro</style></author><author><style face="normal" font="default" size="100%">S. Fritzsche</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author><author><style face="normal" font="default" size="100%">Tashenov, S</style></author><author><style face="normal" font="default" size="100%">F. Fratini</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Relativistic polarization analysis of Rayleigh scattering by atomic hydrogen</style></title><secondary-title><style face="normal" font="default" size="100%">Physical Review A</style></secondary-title><short-title><style face="normal" font="default" size="100%">JPS_Articles PTDC_FIS_117606_2010 PTDC_FIS_117606_2010</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2012</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Oct</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://link.aps.org/doi/10.1103/PhysRevA.86.043405</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">86</style></volume><pages><style face="normal" font="default" size="100%">043405</style></pages><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;A relativistic analysis of the polarization properties of light elastically scattered by atomic hydrogen is performed, based on the Dirac equation and second-order perturbation theory. The relativistic atomic states used for the calculations are obtained by making use of the finite basis set method and are expressed in terms of B splines and B polynomials. We introduce two experimental scenarios in which the light is circularly and linearly polarized, respectively. For each of these scenarios, the polarization-dependent angular distribution and the degrees of circular and linear polarization of the scattered light are investigated as a function of scattering angle and photon energy. Analytical expressions are derived for the polarization-dependent angular distribution which can be used for scattering by both hydrogenic as well as many-electron systems. Detailed computations are performed for Rayleigh scattering by atomic hydrogen within the incident photon energy range 0.5 to 5 keV. Particular attention is paid to the effects that arise from higher (nondipole) terms in the expansion of the electron-photon interaction.&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">&lt;p&gt;PTDC/FIS/117606/2010 &lt;/p&gt;
</style></notes><custom3><style face="normal" font="default" size="100%">papers3://publication/uuid/77891F9F-8A24-44A5-98B0-5053CE3A4F26</style></custom3><label><style face="normal" font="default" size="100%">r04748</style></label></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Safari, L</style></author><author><style face="normal" font="default" size="100%">P Amaro</style></author><author><style face="normal" font="default" size="100%">S. Fritzsche</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author><author><style face="normal" font="default" size="100%">F. Fratini</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Relativistic total cross section and angular distribution for Rayleigh scattering by atomic hydrogen</style></title><secondary-title><style face="normal" font="default" size="100%">Phys. Rev. A</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2012</style></year><pub-dates><date><style  face="normal" font="default" size="100%">May</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://link.aps.org/doi/10.1103/PhysRevA.85.043406</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">85</style></volume><pages><style face="normal" font="default" size="100%">043406</style></pages><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;We study the total cross section and angular distribution in Rayleigh scattering by hydrogen atom in the ground state, within the framework of Dirac relativistic equation and second-order perturbation theory. The relativistic states used for the calculations are obtained by making use of the finite basis-set method and expressed in terms of B splines and B polynomials. We pay particular attention to the effects that arise from higher (nondipole) terms in the expansion of the electron-photon interaction. It is shown that the angular distribution of scattered photons, while symmetric with respect to the scattering angle θ=90∘ within the electric dipole approximation, becomes asymmetric when higher multipoles are taken into account. The analytical expression of the angular distribution is parametrized in terms of Legendre polynomials. Detailed calculations are performed for photons in the energy range 0.5 to 10 keV. When possible, results are compared with previous calculations.&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">&lt;p&gt;PTDC/FIS/117606/2010 &lt;/p&gt;
</style></notes><custom3><style face="normal" font="default" size="100%">papers2://publication/uuid/B7A57D9B-2B5C-48B5-B1CE-CE5321B567D4</style></custom3><label><style face="normal" font="default" size="100%">r14578</style></label></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">Safari, L</style></author><author><style face="normal" font="default" size="100%">P Amaro</style></author><author><style face="normal" font="default" size="100%">S. Fritzsche</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author><author><style face="normal" font="default" size="100%">F. Fratini</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Relativistic total cross section and angular distribution for Rayleigh scattering by atomic hydrogen</style></title><secondary-title><style face="normal" font="default" size="100%">Physical Review A</style></secondary-title><short-title><style face="normal" font="default" size="100%">JPS_Articles PTDC_FIS_117606_2010 PTDC_FIS_117606_2010</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2012</style></year><pub-dates><date><style  face="normal" font="default" size="100%">Apr</style></date></pub-dates></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://link.aps.org/doi/10.1103/PhysRevA.85.043406</style></url></web-urls></urls><volume><style face="normal" font="default" size="100%">85</style></volume><pages><style face="normal" font="default" size="100%">043406</style></pages><language><style face="normal" font="default" size="100%">English</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;We study the total cross section and angular distribution in Rayleigh scattering by hydrogen atom in the ground state, within the framework of Dirac relativistic equation and second-order perturbation theory. The relativistic states used for the calculations are obtained by making use of the finite basis-set method and expressed in terms of B splines and B polynomials. We pay particular attention to the effects that arise from higher (nondipole) terms in the expansion of the electron-photon interaction. It is shown that the angular distribution of scattered photons, while symmetric with respect to the scattering angle θ=90∘ within the electric dipole approximation, becomes asymmetric when higher multipoles are taken into account. The analytical expression of the angular distribution is parametrized in terms of Legendre polynomials. Detailed calculations are performed for photons in the energy range 0.5 to 10 keV. When possible, results are compared with previous calculations.&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">&lt;p&gt;PTDC/FIS/117606/2010 &lt;/p&gt;
</style></notes><custom3><style face="normal" font="default" size="100%">papers3://publication/uuid/B7A57D9B-2B5C-48B5-B1CE-CE5321B567D4</style></custom3><label><style face="normal" font="default" size="100%">r04360</style></label></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">A. Surzhykov</style></author><author><style face="normal" font="default" size="100%">P. Indelicato</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author><author><style face="normal" font="default" size="100%">P Amaro</style></author><author><style face="normal" font="default" size="100%">Th Stöhlker</style></author><author><style face="normal" font="default" size="100%">S. Fritzsche</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Two-photon absorption of few-electron heavy ions</style></title><secondary-title><style face="normal" font="default" size="100%">Physical Review A</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">PACS: 32.90.+a, 32.80.Rm, 32.80.Wr, 31.10.+z</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2011</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://link.aps.org/doi/10.1103/PhysRevA.84.022511</style></url></web-urls></urls><publisher><style face="normal" font="default" size="100%">American Physical Society</style></publisher><volume><style face="normal" font="default" size="100%">84</style></volume><pages><style face="normal" font="default" size="100%">022511</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;The two-photon absorption of few-electron ions has been studied by using second-order perturbation theory and Dirac's relativistic equation. Within this framework, the general expressions for the excitation cross sections and rates are derived including a full account of the higher-order multipole terms in the expansion of the electron-photon interaction. While these expressions can be applied to any ion, independent of its particular shell structure, detailed computations are carried out for the two-photon absorption of hydrogen-, helium-, and berylliumlike ions and are compared with the available theoretical and experimental data. The importance of relativistic and nondipole effects in the analysis and computation of induced two-photon transitions is pointed out. Moreover, we discuss the potential of these transitions for atomic parity-violation studies in the high-Z domain.&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">&lt;p&gt;Copyright (C) 2010 The American Physical SocietyPlease report any problems to prola@aps.orgPRAWebpage CFA-FCTUNL&lt;/p&gt;
</style></notes></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">A. Surzhykov</style></author><author><style face="normal" font="default" size="100%">P. Indelicato</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author><author><style face="normal" font="default" size="100%">P Amaro</style></author><author><style face="normal" font="default" size="100%">Th Stöhlker</style></author><author><style face="normal" font="default" size="100%">S. Fritzsche</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Two-photon absorption of few-electron heavy ions</style></title><secondary-title><style face="normal" font="default" size="100%">Physical Review A</style></secondary-title><short-title><style face="normal" font="default" size="100%">JPS_Articles PTDC_2014 PTDC_2014_TOP5</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2011</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://link.aps.org/doi/10.1103/PhysRevA.84.022511</style></url></web-urls></urls><publisher><style face="normal" font="default" size="100%">American Physical Society</style></publisher><volume><style face="normal" font="default" size="100%">84</style></volume><pages><style face="normal" font="default" size="100%">022511</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;The two-photon absorption of few-electron ions has been studied by using second-order perturbation theory and Dirac&amp;apos;s relativistic equation. Within this framework, the general expressions for the excitation cross sections and rates are derived including a full account of the higher-order multipole terms in the expansion of the electron-photon interaction. While these expressions can be applied to any ion, independent of its particular shell structure, detailed computations are carried out for the two-photon absorption of hydrogen-, helium-, and berylliumlike ions and are compared with the available theoretical and experimental data. The importance of relativistic and nondipole effects in the analysis and computation of induced two-photon transitions is pointed out. Moreover, we discuss the potential of these transitions for atomic parity-violation studies in the high-Z domain.&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">&lt;p&gt;Copyright (C) 2010 The American Physical SocietyPlease report any problems to prola@aps.orgPRAWebpage CFA-FCTUNLJPS-Ref46&lt;/p&gt;
</style></notes><custom3><style face="normal" font="default" size="100%">papers3://publication/uuid/7CF4DAB9-7CB3-4C88-A733-84120E9852C2</style></custom3><label><style face="normal" font="default" size="100%">r00248</style></label></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">A. Surzhykov</style></author><author><style face="normal" font="default" size="100%">A. Volotka</style></author><author><style face="normal" font="default" size="100%">F. Fratini</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author><author><style face="normal" font="default" size="100%">P. Indelicato</style></author><author><style face="normal" font="default" size="100%">G. Plunien</style></author><author><style face="normal" font="default" size="100%">Th Stöhlker</style></author><author><style face="normal" font="default" size="100%">S. Fritzsche</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Angular correlations in the two-photon decay of heliumlike heavy ions</style></title><secondary-title><style face="normal" font="default" size="100%">Physical Review A</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">31.30.jc</style></keyword><keyword><style  face="normal" font="default" size="100%">32.80.Wr</style></keyword><keyword><style  face="normal" font="default" size="100%">PACS: 31.10.+z</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2010</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://link.aps.org/doi/10.1103/PhysRevA.81.042510</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">4</style></number><volume><style face="normal" font="default" size="100%">81</style></volume><pages><style face="normal" font="default" size="100%">042510</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">The two-photon decay of heavy, helium-like ions is investigated based on second-order perturbation theory and Dirac’s relativistic equation. Special attention has been paid to the angular emission of the two photons (i.e., how the angular correlation function depends on the shell structure of the ions in their initial and final states). Moreover, the effects from the (electric and magnetic) nondipole terms in the expansion of the electron-photon interaction are discussed. Detailed calculations have been carried out for the two-photon decay of the 1s2s1S0, 1s2s3S1, and 1s2p3P0 states of helium-like Xe52+, Au77+, and U90+ ions.</style></abstract><notes><style face="normal" font="default" size="100%">Copyright (C) 2010 The American Physical Society Please report any problems to prola@aps.org PRA</style></notes></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">A. Surzhykov</style></author><author><style face="normal" font="default" size="100%">A. Volotka</style></author><author><style face="normal" font="default" size="100%">F. Fratini</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author><author><style face="normal" font="default" size="100%">P. Indelicato</style></author><author><style face="normal" font="default" size="100%">G. Plunien</style></author><author><style face="normal" font="default" size="100%">Th Stöhlker</style></author><author><style face="normal" font="default" size="100%">S. Fritzsche</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Angular correlations in the two-photon decay of heliumlike heavy ions</style></title><secondary-title><style face="normal" font="default" size="100%">Physical Review A</style></secondary-title><short-title><style face="normal" font="default" size="100%">JPS_Articles JPB_SI_HCI_2015</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2010</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://link.aps.org/doi/10.1103/PhysRevA.81.042510</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">4</style></number><publisher><style face="normal" font="default" size="100%">American Physical Society</style></publisher><volume><style face="normal" font="default" size="100%">81</style></volume><pages><style face="normal" font="default" size="100%">042510</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;The two-photon decay of heavy, helium-like ions is investigated based on second-order perturbation theory and Dirac’s relativistic equation. Special attention has been paid to the angular emission of the two photons (i.e., how the angular correlation function depends on the shell structure of the ions in their initial and final states). Moreover, the effects from the (electric and magnetic) nondipole terms in the expansion of the electron-photon interaction are discussed. Detailed calculations have been carried out for the two-photon decay of the 1s2s1S0, 1s2s3S1, and 1s2p3P0 states of helium-like Xe52+, Au77+, and U90+ ions.&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">&lt;p&gt;Copyright (C) 2010 The American Physical SocietyPlease report any problems to prola@aps.orgPRAWebpage CFA-FCTUNLJPS-Ref44&lt;/p&gt;
</style></notes><custom3><style face="normal" font="default" size="100%">papers3://publication/uuid/8186FD5F-A461-454C-9E66-7A8C8C68FA05</style></custom3><label><style face="normal" font="default" size="100%">r00706</style></label></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">R. M. Pinto</style></author><author><style face="normal" font="default" size="100%">R. I. Olariu</style></author><author><style face="normal" font="default" size="100%">J. Lameiras</style></author><author><style face="normal" font="default" size="100%">F. T. Martins</style></author><author><style face="normal" font="default" size="100%">A. A. Dias</style></author><author><style face="normal" font="default" size="100%">G. J. Langley</style></author><author><style face="normal" font="default" size="100%">P. Rodrigues</style></author><author><style face="normal" font="default" size="100%">C. D. Maycock</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author><author><style face="normal" font="default" size="100%">M. F. Duarte</style></author><author><style face="normal" font="default" size="100%">M. T. Fernandez</style></author><author><style face="normal" font="default" size="100%">M. L. Costa</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Study of selected benzyl azides by UV photoelectron spectroscopy and mass spectrometry</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Molecular Structure</style></secondary-title></titles><keywords><keyword><style  face="normal" font="default" size="100%">Benzyl azides UVPES EIMS IRC calculations</style></keyword></keywords><dates><year><style  face="normal" font="default" size="100%">2010</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.sciencedirect.com/science/article/B6TGS-50HYGG6-1/2/4382c3d63371e36f8393d336f3551506</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">1-3</style></number><volume><style face="normal" font="default" size="100%">980</style></volume><pages><style face="normal" font="default" size="100%">163-171</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">Benzyl azide and the three methylbenzyl azides were synthesized and characterized by mass spectrometry (MS) and ultraviolet photoelectron spectroscopy (UVPES). The electron ionization fragmentation mechanisms for benzyl azide and their methyl derivatives were studied by accurate mass measurements and linked scans at constant B/E. For benzyl azide, in order to clarify the fragmentation mechanism, labelling experiments were performed. From the mass analysis of methylbenzyl azides isomers it was possible to differentiate the isomers ortho, meta and para. The abundance and nature of the ions resulting from the molecular ion fragmentation, for the three distinct isomers of substituted benzyl azides, were rationalized in terms of the electronic properties of the substituent. Concerning the para-isomer, IRC calculations were performed at UHF/6-31G(d) level. The photoionization study of benzyl azide, with He(I) radiation, revealed five bands in the 8-21 eV ionization energies region. From every photoelectron spectrum of methylbenzyl azides isomers it has been identified seven bands, on the same range as the benzyl azide. Interpretation of the photoelectron spectra was accomplished applying Koopmans' theorem to the SCF orbital energies obtained at HF/6-311++G(d, p) level.</style></abstract></record><record><source-app name="Biblio" version="6.x">Drupal-Biblio</source-app><ref-type>17</ref-type><contributors><authors><author><style face="normal" font="default" size="100%">R. M. Pinto</style></author><author><style face="normal" font="default" size="100%">R. I. Olariu</style></author><author><style face="normal" font="default" size="100%">J. Lameiras</style></author><author><style face="normal" font="default" size="100%">F. T. Martins</style></author><author><style face="normal" font="default" size="100%">A. A. Dias</style></author><author><style face="normal" font="default" size="100%">G. J. Langley</style></author><author><style face="normal" font="default" size="100%">P. Rodrigues</style></author><author><style face="normal" font="default" size="100%">C. D. Maycock</style></author><author><style face="normal" font="default" size="100%">J P Santos</style></author><author><style face="normal" font="default" size="100%">M. F. Duarte</style></author><author><style face="normal" font="default" size="100%">M. T. Fernandez</style></author><author><style face="normal" font="default" size="100%">M. L. Costa</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">Study of selected benzyl azides by UV photoelectron spectroscopy and mass spectrometry</style></title><secondary-title><style face="normal" font="default" size="100%">Journal of Molecular Structure</style></secondary-title><short-title><style face="normal" font="default" size="100%">JPS_Articles</style></short-title></titles><dates><year><style  face="normal" font="default" size="100%">2010</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">http://www.sciencedirect.com/science/article/B6TGS-50HYGG6-1/2/4382c3d63371e36f8393d336f3551506</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">1-3</style></number><volume><style face="normal" font="default" size="100%">980</style></volume><pages><style face="normal" font="default" size="100%">163-171</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;Benzyl azide and the three methylbenzyl azides were synthesized and characterized by mass spectrometry (MS) and ultraviolet photoelectron spectroscopy (UVPES). The electron ionization fragmentation mechanisms for benzyl azide and their methyl derivatives were studied by accurate mass measurements and linked scans at constant B/E. For benzyl azide, in order to clarify the fragmentation mechanism, labelling experiments were performed. From the mass analysis of methylbenzyl azides isomers it was possible to differentiate the isomers ortho, meta and para. The abundance and nature of the ions resulting from the molecular ion fragmentation, for the three distinct isomers of substituted benzyl azides, were rationalized in terms of the electronic properties of the substituent. Concerning the para-isomer, IRC calculations were performed at UHF/6-31G(d) level. The photoionization study of benzyl azide, with He(I) radiation, revealed five bands in the 8-21 eV ionization energies region. From every photoelectron spectrum of methylbenzyl azides isomers it has been identified seven bands, on the same range as the benzyl azide. Interpretation of the photoelectron spectra was accomplished applying Koopmans&amp;apos; theorem to the SCF orbital energies obtained at HF/6-311++G(d, p) level.&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">&lt;p&gt;Webpage CFA-FCTUNLJPS-Ref42&lt;/p&gt;
</style></notes><custom3><style face="normal" font="default" size="100%">papers3://publication/uuid/A1061D4E-F3EF-44A0-985A-6B1C192328B6</style></custom3><label><style face="normal" font="default" size="100%">r00612</style></label></record></records></xml>