Effect of an Adsorbed Atom on Resonant Charge Exchange in Atom Scattering on Metal Surfaces
R. Taranko, E. Taranko and M. Wiertel
Institute of Physics, M. Curie-Skłodowska University pl. M. Curie-Skłodowskiej 1, 20-031 Lublin, Poland
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Received: January 17, 2003; revised version April 16, 2003
A simple model describing resonant charge transfer between the free-electron metal surface and an atom colliding with it at some distance from another adsorbed atom is presented. The negative ionization probability of a scattered atom is studied within the time-dependent Anderson--Newns model and the time-evolution operator approach. With appropriate models for the considered system, the ionization probability is shown to oscillate with the distance between the adsorbed atom and the collision point of the scattered atom with the metal surface. These oscillations are results of the indirect interaction between the adsorbed and the scattered atoms due to the coupling of both atoms with the metal energy band.
DOI: 10.12693/APhysPolA.103.483
PACS numbers: 79.20.--m, 82.65.+r, 34.70.+e