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Title

Line shape broadening in surface diffusion of interacting adsorbates with quasielastic He atom scattering

AuthorsMartínez Casado, R. ; Vega, J. L.; Sanz, Ángel S. ; Miret-Artés, Salvador
Issue Date2007
PublisherAmerican Physical Society
CitationPhysical Review Letters 98 (21): 216102 (2007)
AbstractThe 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. © 2007 The American Physical Society.
URIhttp://hdl.handle.net/10261/75727
DOI10.1103/PhysRevLett.98.216102
Identifiersdoi: 10.1103/PhysRevLett.98.216102
issn: 0031-9007
Appears in Collections:(CFMAC-IFF) Artículos
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