Computation of the sticking probability of a incident atom on metallic surface. / Cálculo da probabilidade de adesão de átomo incidente em superfície metálica.

AUTOR(ES)
DATA DE PUBLICAÇÃO

1986

RESUMO

A new procedure that calculates sticking coefficients for atomic beams incident upon metallic surfaces is discussed. A model Hamiltonian describing the normal incidence of an ad-atom and its interaction with the conduction electrons of the adsorbate is introduced. The Hamiltonian accounts for two couplings: (1) the overlap between the atomic orbital and the metallic conduction states, allowing charge transfer between incident particle and adsorbate, and (2) the image potential associated with the ionized ad-atom. The electronic and nuclear parts of the model Hamiltonian are diagonalized separately, the former by renormalization group techniques and the second by numerical integration of the Schrödinger equation for the nuclear motion. Through the perturbative treatment, the first order corrections to the adiabatic approximation are presented. The results, showing that the sticking coefficient diminishes rapidly above a characteristic kinetic energy o£ the incident atom, are interpreted.

ASSUNTO(S)

anderson model grupo de renormalização aproximação adiabática numerical renormalization-group modelo de anderson adsorção química adiabatic approximation chemical adsorption coeficiente de adesão sticking coefficient

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