Abstract
Some theoretical aspects of resonant electron transfer processes occurring in the interaction of slow atoms and ions with metal surfaces are surveyed. The emphasis is on cases involving atomic states with large quantum numbers, i.e., on surface interactions of Rydberg atoms and of highly charged ions. Resonant transition rates calculated in first-order adiabatic approximation are examined with regard to their scaling properties, and universal behavior of the rates is disclosed by analyzing the limit of large quantum numbers. Quasiclassical aspects of these results are discussed, and comparison is made with purely classical estimates for the transition rates. Angular momentum effects in resonance ionization of Rydberg atoms are considered explicitly.
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