Recoil ion charge state distributions in low energy Arq+-Ar collisions

Abstract

We have measured the recoil ion charge state distributions in Arq+‐Ar (8≤q≤16) collisions at 2.3 qkeV and 0.18 qkeV by time of flight (TOF) spectroscopy. For Ar8–16+, recoil ion charge states up to 6+ are clearly present, indicating that the 3p subshell in the target atom is being depleted, while for Ar10–16+, there is evidence that target 3s electrons are also being removed. Comparison of the recoil ion charge state spectra at 2.3 and 0.18 qkeV shows that for a given projectile charge, there is very little dependence of the observed recoil target state distribution on projectile energy.