Abstract
Calculations of subshell photoionization processes are performed for various atoms (neon, argon, iron and uranium), for various degrees of ionization, within the independent-particle approximation. We discuss the asymptotic behavior and the high-energy features of these cross sections, focusing on subshell cross-section ratio functions. Near threshold, a modified Dirac-Fock theory is used to study core relaxation effects on photoabsorption for argon. Finally we examine the ionic neon total photoabsorption cross section as a function of degree of ionization.
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