Charge-transfer processes in atom-surface collisions at low energies: a Green's function approach

GARCIA E.; E. C. GOLDBERG; M. C. G. PASSEGGI

SURFACE SCIENCE

ELSEVIER SCIENCE BV

Lugar: Amsterdam; Año: 1995 vol. 325 p. 311 - 322

0039-6028

A Green's functions analysis of the charge transfer probability is performed within the one particle Anderson-Newnsmodel and used to calculate the probabilities of the different charge-states of a scattered or sputtered atom by finite andsemi-infinite linear chains. This formalism has the advantage that it allows one to handle simultaneously continuous bandstates, localized surface states and core-like states of the substrate without a significative increase in the complexity of thenumerical calculation. It also allows one to incorporate, at least within a semi-classical level, the effects on the ionizationprobability of variations in the velocity of the projectile along the trajectory. As expected, these become important at lowvelocities, where velocity changes largely affect the phase interferences taking place within the double transit of theprojectile through the collision region in the scattering process.