Electron-impact ionization of Se24+

Abstract

Cross sections for electron-impact ionization of neonlike selenium have been calculated using close-coupling wave functions. We report cross sections for ionization of the 2${s}^{2}$2${p}^{6}$ $^{1}S$ ground state and the 2${s}^{2}$2${p}^{5}$3s $^{3}P$ excited state of the ion. We found numerous resonances in the ejected electron channels due to excitation of 2${s}^{2}$2${p}^{4}$3snl autoionizing states. The resonances are very narrow, but some have peaks that are several orders of magnitude above the nonresonant background cross section. Even with radiative decay taken into account, the resonances enhance the total integrated cross section by nearly a factor of 4.