Semiquantal Treatment of Electron Loss from Atomic Hydrogen in Rare Gases

A semiquantal description of neutral-neutral collisions is applied to the examination of electron loss from $\mathrm{H}(1s)$ moving in the rare gases He, Ne, Ar, Kr, and Xe. Cross sections for ionization of $\mathrm{H}(1s)$ are calculated for relative speeds $v$ in the range $0.2\ensuremath{\le}v\ensuremath{\le}20$ a.u. Simultaneous transitions in both target and projectile atoms are acknowledged and the relative contribution that arises from collisions in which the electronic state of the rare-gas atom remains unaffected increases from 37% for He to 95% for Xe. Good agreement with previous Born-wave results is obtained.