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Line shape broadening in surface diffusion of interacting adsorbates with quasielastic he atom scattering
R Martínez-Casado1, J L Vega, A S Sanz
1Lehrstuhl für Physikalische Chemie I, Ruhr-Universität Bochum, D-44801 Bochum, Germany. ruth@imaff.cfmac.csic.es
Abstract:
The experimental line shape broadening observed in adsorbate diffusion on metal surfaces with increasing coverage is usually related to the nature of the adsorbate-adsorbate interaction. Here we show that this broadening can also be understood in terms of a fully stochastic model just considering two noise sources: (i) a Gaussian white noise accounting for the surface friction, and (ii) a shot noise replacing the physical adsorbate-adsorbate interaction potential. Furthermore, contrary to what could be expected, for relatively weak adsorbate-substrate interactions the opposite effect is predicted: line shapes get narrower with increasing coverage.
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