QUANTUM APPROACH TO CHARGE-TRANSFER BETWEEN LOW-ENERGY H+ IONS AND ALSURFACES

Resonant charge transfer processes between slow H+ ions from Al surfac es are studied. A one-electron time dependent Anderson-Newns Hamiltoni an represented in a LCAO basis is used to model the ion-substrate char ge transfer mechanism. Keldysh-Green functions are used to solve the n on-equilibrium problem enabling us to obtain the population along the ion's trajectory. The theory reveals to be specially useful as it make s it possible to introduce the realistic 3-D electronic structure of t he surface through the unperturbed Green's functions localized in the Al target site atom(s). Results for a realistic H+-Al collision with p arallel velocity effects are discussed.