Energy Analysis of Electrons Ejected in Slow Ion-Atom Collisions

Abstract

Measured energy spectra of electrons ejected in collisions of ${\mathrm{Ar}}^{+}$ ions with Ar at laboratory kinetic energies from 0.2 to 3 keV consist of a low-energy part, from 0 to ∼9 eV, showing weak oscillatory structure, and a high-energy part, from ∼9 to ∼16 eV, showing pronounced peaks. These peaks can be explained by autoionization processes of superexcited Ar in the states $\cdots 3s3p^6\mathrm{ns}$, $\mathrm{np}$ and $\cdots 3s^{2}3p^{4}4sns$, $\mathrm{np}$.