EFFECT OF THE BAND-STRUCTURE ON CHARGE-EXCHANGE DURING ATOM-SURFACE COLLISIONS

Within the framework of the time-dependent Anderson-Newns model, charg e exchange between an atomic particle and a surface with arbitrary ban d spectrum during scattering is examined. The charge state of the scat tered particle is shown to be, in general, an oscillating function of its energy. Such behavior is a consequence of interference effects ari sing from band finiteness and from the complex structure of electronic states, which develops when an atomic particle interacts with a surfa ce. The possibility of a substantially nonexponential law of atomic-st ate decay is demonstrated. The results obtained are found to give the account for known experimental dependencies.