Quasielastic He atom scattering from surfaces: A stochastic description of the dynamics of interacting adsorbates

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dc.creatorMartinez-Casado, R.
dc.creatorVega, J. L.
dc.creatorSanz, A. S.
dc.creatorMiret-Artes, S
dc.date2007-07-16
dc.date.accessioned2026-07-07T08:18:34Z
dc.date.available2026-07-07T08:18:34Z
dc.descriptionThe study of diffusion and low frequency vibrational motions of particles on metal surfaces is of paramount importance; it provides valuable information on the nature of the adsorbate-substrate and the substrate-substrate interactions. In particular, the experimental broadening observed in the diffusive peak with increasing coverage is usually interpreted in terms of a dipole-dipole like interaction among adsorbates via extensive molecular dynamics calculations within the Langevin framework. Here we present an alternative way to interpret this broadening by means of a purely stochastic description, namely the interacting single adsorbate approximation, where two noise sources are considered: (1) a Gaussian white noise accounting for the surface friction and temperature, and (2) a white shot noise replacing the interaction potential between adsorbates. Standard Langevin numerical simulations for flat and corrugated surfaces (with a separable potential) illustrate the dynamics of Na atoms on a Cu(100) surface which fit fairly well to the analytical expressions issued from simple models (free particle and anharmonic oscillator) when the Gaussian approximation is assumed. A similar broadening is also expected for the frustrated translational mode peaks.
dc.description32 pages, 7 figures
dc.identifierhttps://arxiv.org/abs/0707.2335
dc.identifierhttp://arxiv.org/abs/0707.2335
dc.identifierJ. Phys.: Condens. Matter 19, 305002 (2007)
dc.identifierdoi:10.1088/0953-8984/19/30/305002
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/134475
dc.subjectStatistical Mechanics
dc.subjectMaterials Science
dc.subjectQuantum Physics
dc.titleQuasielastic He atom scattering from surfaces: A stochastic description of the dynamics of interacting adsorbates
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