<?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%">{Guerra, Mauro</style></author><author><style face="normal" font="default" size="100%">Sampaio, Jorge</style></author><author><style face="normal" font="default" size="100%">V{\'ılia, Gon{\c c}alo</style></author><author><style face="normal" font="default" size="100%">César Godinho</style></author><author><style face="normal" font="default" size="100%">Daniel Pinheiro</style></author><author><style face="normal" font="default" size="100%">Amaro, Pedro</style></author><author><style face="normal" font="default" size="100%">José Marques</style></author><author><style face="normal" font="default" size="100%">Machado, Jorge</style></author><author><style face="normal" font="default" size="100%">Indelicato, Paul</style></author><author><style face="normal" font="default" size="100%">Parente, Fernando</style></author><author><style face="normal" font="default" size="100%">Santos, José</style></author></authors></contributors><titles><title><style face="normal" font="default" size="100%">{Fundamental Parameters Related to Selenium K$\alpha$ and K$\beta$ Emission X-ray Spectra}</style></title><secondary-title><style face="normal" font="default" size="100%">Atoms</style></secondary-title></titles><dates><year><style  face="normal" font="default" size="100%">2021</style></year></dates><urls><web-urls><url><style face="normal" font="default" size="100%">https://www.mdpi.com/2218-2004/9/1/8</style></url></web-urls></urls><number><style face="normal" font="default" size="100%">1</style></number><publisher><style face="normal" font="default" size="100%">Multidisciplinary Digital Publishing Institute</style></publisher><volume><style face="normal" font="default" size="100%">9</style></volume><pages><style face="normal" font="default" size="100%">8–10</style></pages><language><style face="normal" font="default" size="100%">eng</style></language><abstract><style face="normal" font="default" size="100%">&lt;p&gt;We present relativistic ab initio calculations of fundamental parameters for atomic selenium, based on the Multiconfiguration Dirac-Fock method. In detail, fluorescence yields and subshell linewidths, both of K shell, as well as K$\beta$ to K$\alpha$ intensity ratio are provided, showing overall agreement with previous theoretical calculations and experimental values. Relative intensities were evaluated assuming the same ionization cross-section for the K-shell hole states, leading to a statistical distribution of these initial states. A method for estimating theoretical linewidths of X-ray lines, where the lines are composed by a multiplet of fine-structure levels that are spread in energy, is proposed. This method provides results that are closer to K$\alpha$1,2 experimental width values than the usual method, although slightly higher discrepancies occur for the K$\beta$1,3 lines. This indicates some inaccuracies in the calculation of Auger rates that have a higher contribution for partial linewidths of the subshells involved in the K$\beta$1,3 profile. Apart from this, the calculated value of K$\beta$ to K$\alpha$ intensity ratio, which is less sensitive to Auger rates issues, is in excellent agreement with recommended values.&lt;/p&gt;
</style></abstract><notes><style face="normal" font="default" size="100%">n/a</style></notes></record></records></xml>