Many-electron theory of charge transfer in ion-surface scattering

A treatment of the time-dependent Anderson-Newns model of ion-surface scattering is formulated by using many-electron wave functions. In its fullest generality, the formalism allows various charge-exchange mechanisms to be described on an equal footing. Within the local-time approximation, the subsidiary set of equations governing resonance transfer can easily be solved numerically. As a specific application, the case of ${\mathrm{Li}}^{+}$ impinging on cesiated W is investigated. Comparison between the calculated results and those obtained using Hartree-Fock wave functions show the former to be in better agreement with experimental data.