Photoionization cross section and resonance structure of ClI

Abstract

The photoionization cross sections for the $3p$ and $3s$ subshells of the ground state of atomic chlorine have been calculated using many-body perturbation theory. We find significant electron-electron correlation effects for both cross sections. Resonances due to the $3p{}_{}{}^4{}_{}{}^{}nd$, $3p{}_{}{}^4{}_{}{}^{}ns$, and $3s3p{}_{}{}^5{}_{}{}^{}np$ configurations, and relaxation effects in the $3p$ subshell cross sections were also calculated.