Initial-state correlation in the electron-impact ionization of argon

Abstract

Ionization of the $3p$ orbital of argon by 113.5 and $200\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ incident electrons is studied by means of the post version of the CDW-EIS model. Results are presented for 2, 5, and $10\phantom{\rule{0.3em}{0ex}}\mathrm{eV}$ ejected electrons and compared to recent experimental data from Lohmann and collaborators. The present results are also compared to those obtained by other state-of-the-art theoretical methods. The present system is extremely sensitive to the way in which the post-collision interaction, the electronic exchange and the initial state correlation are considered. We conclude that none of the here discussed methods provides an ultimate description of the system and further theoretical work is needed.