Abstract
The sticking of an atom on a cold surface is treated by considering the decay of a gas atom state in a closed vessel (gettering process), owing to the inelastic interaction with the elementary excitations of the substrate (phonons or electron-hole pairs). By using a formalism, which includes higher order processes, we have obtained the sticking coefficient and the reflection probabilities in a unitary way, in terms of the imaginary part of the gas atom self energy owing to the inelastic interaction with the substrate. We discuss the sticking coefficient of atomic hydrogen and deuterium on a model metal, by assuming that the inelastic process is given by the electron-hole pair excitation mechanism.
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