NONADIABATIC EFFECTS IN CHARGE-TRANSFER IN ATOM-SURFACE SCATTERING

Using a recently developed many-body theory, we investigate the veloci ty dependence of charge transfer in atom-surface scattering. We show t hat under certain conditions, intra-atomic correlation effects can int roduce nontrivial sources of nonadiabaticity. For situations where a s harp Kondo resonance is formed near the Fermi energy, the system can e xhibit strong nonadiabatic effects even at low velocities. This nonadi abatic behavior is caused by the relatively long-time scale for the fo rmation or survival of the Kondo peak.