We have carried out a generalization of the continuum-distorted-wave-eikonal-initial-state (CDW-EIS) approximation for ion-impact single ionization where the interaction of the active electron with the target is represented by a Hartree-Fock potential. We apply this model to the ionization of He, Ne and Ar by proton and multiply-charged bare-ion impact. Doubly differential and total cross sections are calculated from each subshell. These cross sections summed over all subshells show a much better agreement with experimental data than those obtained from the previous formulations of the CDW-EIS approximation which use hydrogenic wavefunctions with effective charges.
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Gulyás et al. (1995) studied this question.