{Fundamental Parameters Related to Selenium K$\alpha$ and K$\beta$ Emission X-ray Spectra}

Citation:
{Guerra, Mauro, Jorge Sampaio, Gon{\c c}alo V{\'ılia, César Godinho, Daniel Pinheiro, Pedro Amaro, José Marques, Jorge Machado, Paul Indelicato, Fernando Parente, and José Santos. "{Fundamental Parameters Related to Selenium K$\alpha$ and K$\beta$ Emission X-ray Spectra}." Atoms. 9 (2021): 8-10.

Abstract:

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.

Notes:

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