Ejected electron spectroscopy: Ionization in ion-atom collisions

The continuum-distorted-wave eikonal-initial-state (CDW-EIS) approximation has had much success describing the single ionization of a bare atom by ion impact within the non-perturbative regime [Proc. R. Soc. Lond. A. 452 175–184 (1996)]. This model is first order in a distorted wave series incorporating an eikonal phase distortion in the initial state and a continuum-distorted-wave in the final state. The latter of these accounts for the ejected electron travelling in the presence of two long ranged Coulomb potentials. The single ionization of multielectron atoms shall be discussed, with particular emphasis on heavier targets such as neon and argon. A comparison will be made with other available theoretical models and experimental data.