@article {J._P._Santos_75005553, title = {Reference-free measurements of the 1s2s2p2P1/2,3/2o\rightarrow1s22s2S1/2 and 1s2s2p4P5/2\rightarrow1s22s2S1/2 transition energies and widths in lithiumlike sulfur and argon ions}, journal = {Physical Review A}, year = {2020}, note = {n/a}, abstract = {n/a}, doi = {10.1103/PhysRevA.101.062505}, url = {http://doi.org/10.1103/PhysRevA.101.062505}, author = {J P Santos and Machado, J and Bian, Guojie and Nancy Paul and Trassinelli, M and P Amaro and M Guerra and Szabo, C. I. and Gumberidze, A. and Isac, J. M. and J P Santos and J. P. Desclaux and P. Indelicato} } @article {J._P._Santos_66758876, title = {Relativistic electron impact ionization cross sections of carbon ions and application to an optically thin plasma}, journal = {Astronomy \& Astrophysics}, year = {2019}, note = {n/a}, abstract = {n/a}, issn = {0004-6361}, doi = {10.1051/0004-6361/201935337}, url = {http://doi.org/10.1051/0004-6361/201935337}, author = {J P Santos} } @article {J._P._Santos_60599727, title = {Revisiting the Fe xvii Line Emission Problem: Laboratory Measurements of the 3s{\textendash}2p and 3d{\textendash}2p Line-formation Channels}, journal = {The Astrophysical Journal}, year = {2019}, note = {n/a}, abstract = {n/a}, doi = {10.3847/1538-4357/ab2896}, url = {http://doi.org/10.3847/1538-4357/ab2896}, author = {J P Santos and Chintan Shah and Jos{\'e} R. Crespo L{\'o}pez-Urrutia and Ming Feng Gu and Thomas Pfeifer and Jos{\'e} Marques and Filipe Grilo and Jos{\'e} Paulo Santos and Amaro, Pedro} } @article {12490, title = {Radiative transition rates of 1s2s(3S)3p levels for Li-like ions with 5 \<= Z \<= 10}, journal = {Nuclear Inst. and Methods in Physics Research, B}, volume = {408}, year = {2017}, note = {n/a}, month = {Oct 01}, pages = {100-102}, publisher = {Elsevier B.V.}, abstract = {

Nuclear Inst. and Methods in Physics Research, B, 408 (2017) 100-102. doi:10.1016/j.nimb.2017.04.015

}, url = {http://dx.doi.org/10.1016/j.nimb.2017.04.015}, author = {J P Santos and F. Parente and M. C. Martins and P. Indelicato and Benis, E P and Zouros, T J M and J. P. Marques} } @article {12491, title = {Relativistic calculations of screening parameters and atomic radii of neutral atoms}, journal = {Atomic Data and Nuclear Data Tables}, volume = {117-118}, year = {2017}, note = {n/a}, month = {Jul 14}, pages = {439-457}, publisher = {Elsevier Inc.}, abstract = {

Atomic Data and Nuclear Data Tables, 117-118 (2017) 439-457. doi:10.1016/j.adt.2017.01.001

}, url = {http://dx.doi.org/10.1016/j.adt.2017.01.001}, author = {M Guerra and P Amaro and J P Santos and P. Indelicato} } @article {10144, title = {Relativistic calculations of K-, L- and M-shell X-ray production cross-sections by electron impact for Ne, Ar, Kr, Xe, Rn and Uuo}, journal = {Journal of Quantitative Spectroscopy and Radiative Transfer}, volume = {182}, number = {C}, year = {2016}, note = {n/a}, month = {Oct 01}, pages = {87-93}, publisher = {Elsevier}, abstract = {

Journal of Quantitative Spectroscopy and Radiative Transfer, 182 + (2016) 87-93. doi:10.1016/j.jqsrt.2016.05.012

}, url = {http://dx.doi.org/10.1016/j.jqsrt.2016.05.012}, author = {Sampaio, J M and Madeira, T I and M Guerra and F. Parente and P. Indelicato and J P Santos and J. P. Marques} } @article {10151, title = {Relativistic evaluation of the two-photon decay of the metastable 1s22s2p 3P0 state in berylliumlike ions with an effective-potential model}, journal = {Physical Review A}, volume = {93}, number = {3}, year = {2016}, note = {n/a}, month = {Mar 07}, pages = {032502-8}, publisher = {American Physical Society}, abstract = {

The two-photon $1{s}^{2}2s2p\phantom{\rule{0.16em}{0ex}}{}^{3}{P}_{0}\ensuremath{\rightarrow}1{s}^{2}{s}^{2}\phantom{\rule{0.16em}{0ex}}{}^{1}{S}_{0}$ transition in berylliumlike ions is investigated theoretically within a fully relativistic framework and a second-order perturbation theory. 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.

}, url = {http://link.aps.org/doi/10.1103/PhysRevA.93.032502}, author = {Amaro, Pedro and Fratini, Filippo and Safari, Laleh and Machado, Jorge and Guerra, Mauro and Indelicato, Paul and Santos, Jose Paulo} } @article {8089, title = {Relativistic calculations of atomic parameters in Ununoctium}, journal = {Journal of Physics: Conference Series}, volume = {635}, number = {9}, year = {2015}, note = {n/a}, month = {Sep 07}, pages = {092095-2}, abstract = {n/a}, url = {http://stacks.iop.org/1742-6596/635/i=9/a=092095?key=crossref.1c62be1496fbf6f148f3b54705766c5e}, author = {Sampaio, J M and M Guerra and Madeira, T I and F. Parente and P. Indelicato and J P Santos and J. P. Marques} } @article {8148, title = {Relativistic calculation of K-, L- and M-shell x-ray fluorescence yields for Ba}, journal = {Physica Scripta}, volume = {90}, number = {5}, year = {2015}, note = {n/a}, month = {Apr 22}, pages = {1-3}, publisher = {IOP Publishing}, abstract = {

Physica Scripta, 90(2015) 054009. doi:10.1088/0031-8949/90/5/054009

}, url = {http://dx.doi.org/10.1088/0031-8949/90/5/054009}, author = {Madeira, T I and Sampaio, J M and M Guerra and F. Parente and P. Indelicato and J P Santos and J. P. Marques} } @article {8072, title = {Relativistic calculations of M-shell photoionization and X-ray production cross-sections for Hg at 5.96 keV excitation energy}, journal = {Radiation Physics and Chemistry}, volume = {107}, year = {2015}, note = {n/a}, pages = {36}, abstract = {

In this work we calculate photoionization and X-ray production cross-sections (XPCS) of M-shell vacancies in Hg at incident photon energy of 5.96 keV (low.

}, url = {http://www.sciencedirect.com/science/article/pii/S0969806X14003740}, author = {Sampaio, J M and Madeira, T I and F. Parente and P. Indelicato and J P Santos and J. P. Marques} } @article {6846, title = {Relativistic Calculation of K-, L-, and M-Shell X-Ray Fluorescence Yields for Ba}, year = {2014}, note = {n/a}, month = {Dec 17}, pages = {1-5}, abstract = {n/a}, author = {Madeira, T I} } @article {6855, title = {Relativistic calculations of M-shell photoionization and X-ray production cross-sections for Hg at 5.96 keV excitation energy}, journal = {Radiation Physics and Chemistry}, volume = {107}, year = {2014}, note = {n/a}, pages = {36}, abstract = {

In this work we calculate photoionization and X-ray production cross-sections (XPCS) of M-shell vacancies in Hg at incident photon energy of 5.96 keV (low.

}, url = {http://www.sciencedirect.com/science/article/pii/S0969806X14003740}, author = {Sampaio, J M and Madeira, T I and F. Parente and P. Indelicato and J P Santos and J. P. Marques} } @article {5671, title = {Reference free, high-precision measurements of transition energies in few electron argon ions}, journal = {AIP APPLICATION OF ACCELERATORS IN RESEARCH AND INDUSTRY: Twenty-Second International Conference}, volume = {1525}, number = {1}, year = {2013}, note = {

journal = {AIP Conference Proceedings}

}, pages = {68-72}, publisher = {AIP}, abstract = {

The use of a vacuum double crystal spectrometer, coupled to an electron-cyclotron resonance ion source (ECRIS), allows to measure low-energy x-ray transitions energies in highly-charged ions with accuracies of the order of a few parts per million. We have used this installation to measure the 1s2p 1 P1 - 1s2 1 S0 diagram line and the 1s2s 3 S1 - 1s2 1 S0 forbidden M1 transition energies in helium-like argon, the 1s2s2p 2 P j 1s2 2s 2 S1/2 transitions in lithium-like argon and the 1s2s2 2p 1 P1 - 1s2 2s2 1 S0 transition in beryllium-like argon. These transition measurements have accuracies between 2 and 4 ppm depending on the line intensity. Thanks to the excellent agreement between the simulations and the measurements, we were also able to measure the transition width of all the allowed transitions. The results are compared to recent QED and relativistic many-body calculations.

}, url = {http://link.aip.org/link/?APC/1525/68/1}, author = {Szabo, Csilla I and Amaro, Pedro and Guerra, Mauro and Schlesser, Sophie and Gumberidze, Alexander and Santos, Jose Paulo and Indelicato, Paul}, editor = {McDaniel, Floyd D and Doyle, Barney L and Glass, Gary A and Wang, Yongqiang} } @article {8076, title = {Reference free, high-precision measurements of transition energies in few electron argon ions}, journal = {AIP Conf. Proc.}, volume = {1525}, number = {1}, year = {2013}, note = {

journal = {AIP Conference Proceedings}

}, pages = {68-72}, publisher = {AIP}, abstract = {

The use of a vacuum double crystal spectrometer, coupled to an electron-cyclotron resonance ion source (ECRIS), allows to measure low-energy x-ray transitions energies in highly-charged ions with accuracies of the order of a few parts per million. We have used this installation to measure the 1s2p 1 P1 - 1s2 1 S0 diagram line and the 1s2s 3 S1 - 1s2 1 S0 forbidden M1 transition energies in helium-like argon, the 1s2s2p 2 P j 1s2 2s 2 S1/2 transitions in lithium-like argon and the 1s2s2 2p 1 P1 - 1s2 2s2 1 S0 transition in beryllium-like argon. These transition measurements have accuracies between 2 and 4 ppm depending on the line intensity. Thanks to the excellent agreement between the simulations and the measurements, we were also able to measure the transition width of all the allowed transitions. The results are compared to recent QED and relativistic many-body calculations.

}, url = {http://link.aip.org/link/?APC/1525/68/1}, author = {Szabo, Csilla I and Amaro, Pedro and Guerra, Mauro and Schlesser, Sophie and Gumberidze, Alexander and Santos, Jose Paulo and Indelicato, Paul}, editor = {McDaniel, Floyd D and Doyle, Barney L and Glass, Gary A and Wang, Yongqiang} } @article {2898, title = {Relativistic polarization analysis of Rayleigh scattering by atomic hydrogen}, journal = {Phys. Rev. A}, volume = {86}, year = {2012}, note = {

PTDC/FIS/117606/2010

}, month = {Oct}, pages = {043405}, abstract = {

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.

}, url = {http://link.aps.org/doi/10.1103/PhysRevA.86.043405}, author = {Safari, L and P Amaro and S. Fritzsche and J P Santos and Tashenov, S and F. Fratini} } @article {8115, title = {Relativistic polarization analysis of Rayleigh scattering by atomic hydrogen}, journal = {Physical Review A}, volume = {86}, year = {2012}, note = {

PTDC/FIS/117606/2010

}, month = {Oct}, pages = {043405}, abstract = {

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.

}, url = {http://link.aps.org/doi/10.1103/PhysRevA.86.043405}, author = {Safari, L and P Amaro and S. Fritzsche and J P Santos and Tashenov, S and F. Fratini} } @article {2901, title = {Relativistic total cross section and angular distribution for Rayleigh scattering by atomic hydrogen}, journal = {Phys. Rev. A}, volume = {85}, year = {2012}, note = {

PTDC/FIS/117606/2010

}, month = {May}, pages = {043406}, abstract = {

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=90o 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.

}, url = {http://link.aps.org/doi/10.1103/PhysRevA.85.043406}, author = {Safari, L and P Amaro and S. Fritzsche and J P Santos and F. Fratini} } @article {8142, title = {Relativistic total cross section and angular distribution for Rayleigh scattering by atomic hydrogen}, journal = {Physical Review A}, volume = {85}, year = {2012}, note = {

PTDC/FIS/117606/2010

}, month = {Apr}, pages = {043406}, abstract = {

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=90o 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.

}, url = {http://link.aps.org/doi/10.1103/PhysRevA.85.043406}, author = {Safari, L and P Amaro and S. Fritzsche and J P Santos and F. Fratini} } @article {705, title = {Relativistic transition wavelenghts and probabilities for spectral lines of Ne II}, journal = {The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics}, volume = {63}, number = {1}, year = {2011}, note = {

Webpage CFA-FCTUNL

}, pages = {89-96}, publisher = {Springer Berlin / Heidelberg}, abstract = {

Transition wavelengths and probabilities for several 2 p 4 3 p -2 p 4 3 s and 2 p 4 3 d -2 p 4 3 p lines in fluorine-like neon ion (NeII) have been calculated within the multiconfiguration Dirac-Fock (MCDF) method with quantum electrodynamics (QED) corrections. The results are compared with all existing experimental and theoretical data.

}, keywords = {Physics and Astronomy}, isbn = {1434-6060}, url = {http://dx.doi.org/10.1140/epjd/e2011-10715-2}, author = {Santos, J. and Costa, A. and Madruga, C. and F. Parente and P. Indelicato} } @article {8071, title = {Relativistic transition wavelenghts and probabilities for spectral lines of Ne II}, journal = {The European Physical Journal D}, volume = {63}, number = {1}, year = {2011}, note = {

Webpage CFA-FCTUNLJPS-Ref48The European Physical Journal D - Atomic, Molecular, Optical and Plasma Physics

}, pages = {89-96}, publisher = {Springer Berlin / Heidelberg}, abstract = {

Transition wavelengths and probabilities for several 2 p 4 3 p -2 p 4 3 s and 2 p 4 3 d -2 p 4 3 p lines in fluorine-like neon ion (NeII) have been calculated within the multiconfiguration Dirac-Fock (MCDF) method with quantum electrodynamics (QED) corrections. The results are compared with all existing experimental and theoretical data.

}, url = {http://dx.doi.org/10.1140/epjd/e2011-10715-2}, author = {J P Santos and Costa, A. and Madruga, C. and F. Parente and P. Indelicato} } @article {202, title = {Resonance effects on the two-photon emission from hydrogenic ions}, journal = {Physical Review A (Atomic, Molecular, and Optical Physics)}, volume = {79}, number = {6}, year = {2009}, pages = {062504}, abstract = {A theoretical study of the all two-photon transitions from initial bound states with ni=2,3 in hydrogenic ions is presented. High-precision values of relativistic decay rates for ions with nuclear charge in the range 1<=Z<=92 are obtained through the use of finite basis sets for the Dirac equation constructed from B splines. We also report the spectral (energy) distributions of several resonant transitions, which exhibit interesting structures, such as zeros in the emission spectrum, indicating that two-photon emission is strongly suppressed at certain frequencies. We compare two different approaches (the line profile approach and the QED approach based on the analysis of the relativistic two-loop self-energy) to regularize the resonant contribution to the decay rate. Predictions for the pure two-photon contributions obtained in these approaches are found to be in good numerical agreement.}, keywords = {bound states Dirac equation quantum electrodynamics radiative lifetimes two-photon processes}, doi = {DOI: 10.1103/PhysRevA.79.062504}, url = {http://link.aps.org/abstract/PRA/v79/e06250}, author = {P Amaro and J P Santos and F. Parente and A. Surzhykov and P. Indelicato} } @article {8141, title = {Resonance effects on the two-photon emission from hydrogenic ions}, journal = {Physical Review A}, volume = {79}, number = {6}, year = {2009}, note = {

Webpage CFA-FCTUNLJPS-Ref36

}, pages = {062504}, abstract = {

A theoretical study of the all two-photon transitions from initial bound states with ni=2,3 in hydrogenic ions is presented. High-precision values of relativistic decay rates for ions with nuclear charge in the range 1\<=Z\<=92 are obtained through the use of finite basis sets for the Dirac equation constructed from B splines. We also report the spectral (energy) distributions of several resonant transitions, which exhibit interesting structures, such as zeros in the emission spectrum, indicating that two-photon emission is strongly suppressed at certain frequencies. We compare two different approaches (the line profile approach and the QED approach based on the analysis of the relativistic two-loop self-energy) to regularize the resonant contribution to the decay rate. Predictions for the pure two-photon contributions obtained in these approaches are found to be in good numerical agreement.

}, url = {http://journals.aps.org/pra/abstract/10.1103/PhysRevA.79.062504}, author = {P Amaro and J P Santos and F. Parente and A. Surzhykov and P. Indelicato} } @article {209, title = {Relativistic calculation of K\α hypersatellite line energies and transition probabilities for selected atoms with 12<=Z<=80}, journal = {Journal of Physics B: Atomic, Molecular and Optical Physics}, volume = {40}, number = {1}, year = {2007}, pages = {57}, abstract = {The transition probabilities of K\α hypersatellite lines and energy shifts with respect to the corresponding diagram lines are computed using the Dirac\–Fock model for several values of atomic number Z throughout the periodic table. The influence of the Breit interaction on the K\α1h/K\α2h line intensity ratio, K\α1h and K\α2h line energy shifts and K\α1h to K\α2h line energy splitting is evaluated. Double-K shell hole threshold values for selected elements with 23 \⩽Z\⩽ 30, calculated within the same approach, are compared with available experimental results.}, url = {http://stacks.iop.org/0953-4075/40/57}, author = {A. M. Costa and M. C. Martins and J P Santos and P. Indelicato and F. Parente} } @article {8053, title = {Relativistic calculation of K\&alpha; hypersatellite line energies and transition probabilities for selected atoms with 12 <= Z <= 80}, journal = {Journal of Physics B: Atomic, Molecular and Optical Physics}, volume = {40}, number = {1}, year = {2007}, note = {

JPS-Ref30

}, pages = {57}, abstract = {

The transition probabilities of K\&alpha; hypersatellite lines and energy shifts with respect to the corresponding diagram lines are computed using the Dirac\&ndash;Fock model for several values of atomic number \<I\>Z\</I\> throughout the periodic table. The influence of the Breit interaction on the K\&alpha;\<SUB\>1\</SUB\>\<SUP\>h\</SUP\>/K\&alpha;\<SUB\>2\</SUB\>\<SUP\>h\</SUP\> line intensity ratio, K\&alpha;\<SUB\>1\</SUB\>\<SUP\>h\</SUP\> and K\&alpha;\<SUB\>2\</SUB\>\<SUP\>h\</SUP\> line energy shifts and K\&alpha;\<SUB\>1\</SUB\>\<SUP\>h\</SUP\> to K\&alpha;\<SUB\>2\</SUB\>\<SUP\>h\</SUP\> line energy splitting is evaluated. Double-K shell hole threshold values for selected elements with 23 \&les;\<I\>Z\</I\>\&les; 30, calculated within the same approach, are compared with available experimental results.

}, url = {http://stacks.iop.org/0953-4075/40/57 }, author = {A. M. Costa and M. C. Martins and J P Santos and P. Indelicato and F. Parente} } @article {8087, title = {Relativistic calculation of Kβ hypersatellite energies and transition probabilities for selected atoms with 13 <= Z <= 80}, journal = {Journal of Physics B: Atomic and Molecular Physics}, volume = {39 }, number = {11}, year = {2006}, note = {

JPS-Ref29

}, pages = {2355{\textendash}2366}, abstract = {

Energies and transition probabilities of Kβ hypersatellite lines are computed using the Dirac{\textendash}Fock model for several values of Z throughout the periodic table. The influence of the Breit interaction on the energy shifts from the corresponding diagram lines and on the Kβh1/Kβh3 intensity ratio is evaluated. The widths of the double-K hole levels are calculated for Al and Sc. The results are compared to experiment and to other theoretical calculations.Al_Sc_Mg_Ti

}, url = {http://www.iop.org/EJ/abstract/0953-4075/39/11/004}, author = {A. M. Costa and M. C. Martins and J P Santos and P. Indelicato and F. Parente} } @article {212, title = {Relativistic calculation of Kβ hypersatellite energies and transition probabilities for selected atoms with 13<=Z<=80}, journal = {Journal of Physics B: Atomic and Molecular Physics}, volume = {39}, number = {11}, year = {2006}, pages = {2355{\textendash}2366}, abstract = {Energies and transition probabilities of Kβ hypersatellite lines are computed using the Dirac{\textendash}Fock model for several values of Z throughout the periodic table. The influence of the Breit interaction on the energy shifts from the corresponding diagram lines and on the Kβh1/Kβh3 intensity ratio is evaluated. The widths of the double-K hole levels are calculated for Al and Sc. The results are compared to experiment and to other theoretical calculations.}, url = {http://www.iop.org/EJ/abstract/0953-4075/39/11/004}, author = {A. M. Costa and M. C. Martins and J P Santos and P. Indelicato and F. Parente} } @article {213, title = {Relativistic correlation correction to the binding energies of the ground configuration of beryllium-like, neon-like, magnesium-like and argon-like ions}, journal = {The European Physical Journal D}, volume = {37}, number = {2}, year = {2006}, note = {DOI: 10.1140/epjd/e2006-00002-x PACS 31.30.Jv - Relativistic and quantum electrodynamic effects in atoms and molecules. 31.25.Eb - Electron correlation calculations for atoms and ions: ground state.}, pages = {201-207}, abstract = {Total electronic correlation corrections to the binding energies of the isoelectronic series of beryllium, neon, magnesium and argon, are calculated in the framework of relativistic multiconfiguration Dirac-Fock method. Convergence of the correlation energies is studied as the active set of orbitals is increased. The Breit interaction is treated fully self-consistently. The final results can be used in the accurately determination of atomic masses from highly charged ions data obtained in Penning-trap experiments.}, url = {http://www.edpsciences.org/articles/epjd/abs/2006/02/d05302/d05302.html}, author = {J P Santos and G. C. Rodrigues and J. P. Marques and F. Parente and J. P. Desclaux and P. Indelicato} } @article {8048, title = {Relativistic correlation correction to the binding energies of the ground configuration of beryllium-like, neon-like, magnesium-like and argon-like ions}, journal = {The European Physical Journal D}, volume = {37}, number = {2}, year = {2006}, note = {

DOI: 10.1140/epjd/e2006-00002-xPACS31.30.Jv - Relativistic and quantum electrodynamic effects in atoms and molecules.31.25.Eb - Electron correlation calculations for atoms and ions: ground state. JPS-Ref28

}, pages = {201-207}, abstract = {

Total electronic correlation corrections to the binding energies of the isoelectronic series of beryllium, neon, magnesium and argon, are calculated in the framework of relativistic multiconfiguration Dirac-Fock method. Convergence of the correlation energies is studied as the active set of orbitals is increased. The Breit interaction is treated fully self-consistently. The final results can be used in the accurately determination of atomic masses from highly charged ions data obtained in Penning-trap experiments.

}, url = {http://www.edpsciences.org/articles/epjd/abs/2006/02/d05302/d05302.html}, author = {J P Santos and G. C. Rodrigues and J. P. Marques and F. Parente and J. P. Desclaux and P. Indelicato} } @article {215, title = {Relativistic transition probabilities for F-like ions with 10PACS: 31.25.Jf; 32.30.Rj; 32.70.Cs JPS-Ref22

}, pages = {171-173}, abstract = {

In the present work we have calculated several relativistic transition probabilities for the F-like ions with 10 less-than-or-equals, slant Z less-than-or-equals, slant 49, in the framework of the Multi-Configuration Dirac{\textendash}Fock method, for applications on laserphysics and astrophysics. The lines considered correspond to transitions between levels of 2p43s, 2p43p and 2p43d configurations. The spectral fine structure is taken into consideration and the results for individual lines are given.

}, url = {http://www.sciencedirect.com/science/article/pii/S0168583X05003976}, author = {J P Santos and Madruga, C. and F. Parente and P. Indelicato} } @article {8093, title = {Relativistic calculation of two-electron one-photon and hypersatellite transition energies for 12\<=Z\<=30 elements}, journal = {Journal of Physics B: Atomic and Molecular Physics}, volume = {37}, year = {2004}, note = {

JPS-Ref20

}, pages = {3785-3795}, abstract = {

Energies of two-electron one-photon transitions from initial double K-hole states were computed using the Dirac{\textendash}Fock model. The transition energies of competing processes, the Ka hypersatellites, were also computed. The results are compared with experiment and to other theoretical calculations.

}, url = {http://www.iop.org/EJ/abstract/0953-4075/37/19/001/}, author = {M. C. Martins and A. M. Costa and J P Santos and F. Parente and P. Indelicato} } @article {8081, title = {Relativistic and many-body effects on total binding energies of Cesium and other highly-charged ion}, journal = {Physica Scripta}, volume = {T92}, year = {2001}, note = {

JPS-Ref10

}, pages = {327}, abstract = {

The determination of atomic masses from highly ionized atoms using Penning Traps requires precise values for electronic binding energies. In the present work, binding energies of several ions (from several elements) are calculated in the framework of two relativistic many-body methods: Relativistic Many-Body Perturbation Theory (RMBPT) and Multi-Configuration Dirac{\textendash} Fock (MCDF). The ions studied in this work are: Cl (He and Li-like), Se (F and Ne-like), Cs (He, Be, Ne, Al, Cl, Ar, K, Kr, Xe-like and neutral Cs), Hg, Pb and U (Br and Kr-like). Some of them are presented in this paper. Cesium has been treated in more details, allowing for a systematic comparison between MCDF and RMBPT methods. The Cs ions binding energies allow for the determination of atomic Cs mass, which can be used in a QED-independent fine structure constant determination.

}, author = {P. Indelicato and G. C. Rodrigues and E. Lindroth and M. A. Ourdane and F. Parente and J P Santos and P. Patt{\'e} and J. Bieron} } @article {8092, title = {Relativistic Calculations for Trapped Ions}, journal = {Hyperfine Interactions}, volume = {132}, number = {1/4}, year = {2001}, note = {

JPS-Ref09

}, pages = {347-361}, abstract = {

We present recent results in the field of total binding energy calculations, Land\&shchcy; factors, quantum electrodynamics corrections and lifetime that are of interest for ion traps and ion sources. We describe in detail MCDF and RMBPT calculation of ionic binding energies, which are needed for the determination of atomic masses from highly charged ion measurements. We also show new results concerning Land\&shchcy; factor in 3-electron ions. Finally we describe how relativistic calculations can help understand the physics of heavy ion production ion sources.

}, url = {http://www.springerlink.com/content/h32m6mq8w8578482/}, author = {P. Indelicato and E. Lindroth and T. Beier and J. Bieron and A. M. Costa and I. Lindgren and J. P. Marques and Martenson-Pendrill, A M and M. C. Martins and M. A. Ourdane and F. Parente and P. Patt{\'e} and G. C. Rodrigues and S. Salomonson and J P Santos} } @article {8107, title = {Relativistic 2s1/2 (L1) atomic subshell radiationless transition probabilities for Yb and Hg}, journal = {Atomic Data and Nuclear Data Tables}, volume = {76}, number = {1}, year = {2000}, note = {

doi:10.1006/adnd.2000.0837JPS-Ref06

}, pages = {49-69}, abstract = {

Radiationless transition rates to L1 vacancy states have been calculated ab initio in the Dirac-Fock approximation. The calculations include quantum-electrodynamic corrections. Results in the jj coupling scheme for all possible L1 transitions are tabulated for elements Yb and Hg.

}, author = {J P Santos and J. P. Marques and F. Parente and P. Indelicato and J. P. Desclaux} } @article {8088, title = {Relativistic 2s1/2 (L1) atomic subshell decay rates and fluorescence yields for Yb and Hg}, journal = {Journal of Physics B: Atomic and Molecular Physics}, volume = {32}, year = {1999}, note = {

JPS-Ref05

}, pages = {2089}, abstract = {n/a}, url = {http://iopscience.iop.org/0953-4075/32/9/304/}, author = {J P Santos and J. P. Marques and F. Parente and E. Lindroth and P. Indelicato and J. P. Desclaux} } @article {8059, title = {Rydberg states of atoms in parallel electric and magnetic fields}, journal = {Physical Review A}, volume = {59}, number = {2}, year = {1999}, note = {

JPS - Ref 04

}, pages = {1703-1706}, publisher = {American Physical Society}, abstract = {

We present theoretical results for the photoabsorption spectrum of an atom in parallel electric and magnetic fields, using the R-matrix method combined with quantum-defect theory. We introduce a radial basis set which is complete and orthonormal over a semi-infinite interval [r0,(infinity)), to allow calculations to be performed for high Rydberg states in nonhydrogenic atoms without encountering problems due to linear dependence of the basis set. The nonhydrogenic character of the spectra is analyzed for Li and Rb, and a comparison is made with previous high-precision experiments which shows that the theoretical results agree very well with experiment.

}, url = {http://link.aps.org/doi/10.1103/PhysRevA.59.1703}, author = {J P Santos and F. Mota-Furtado and M. F. Laranjeira and F. Parente} } @article {8062, title = {Rydberg wave packets in parallel electric and magnetic fields}, journal = {Physical Review A}, volume = {55}, number = {5}, year = {1997}, note = {

JPS-Ref01

}, pages = {3724-3729}, abstract = {

The magnitude of the time autocorrelation function M between states excited by two Gaussian laser pulses is calculated for both hydrogen and rubidium atoms inparallel electric and magnetic fields. M is determined by a full quantum-mechanical calculation but the peaks are identified with the periods of the shortest periodicorbits of the corresponding classical system. Qualitative agreement is obtained with experimental results, however, discrepancies are found in the relative heights ofthe peaks.

}, author = {I. Moser and F. Mota-Furtado and O\'Mahony, P F and J P Santos} }