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Line Shape Broadening in Surface Diffusion of Interacting Adsorbates with Quasielastic He Atom Scattering

R. Martinez-Casado·J. L. Vega·A. S. Sanz·S. Miret-Artes
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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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R. Martinez-Casado, J. L. Vega, A. S. Sanz, S. Miret-Artes. 2007-05-24. Line Shape Broadening in Surface Diffusion of Interacting Adsorbates with Quasielastic He Atom Scattering. https://doi.org/10.1103/physrevlett.98.216102

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