{
  "id": "0707.2335",
  "version": "v1",
  "published": "2007-07-16T14:53:24.000Z",
  "updated": "2007-07-16T14:53:24.000Z",
  "title": "Quasielastic He atom scattering from surfaces: A stochastic description of the dynamics of interacting adsorbates",
  "authors": [
    "R. Martinez-Casado",
    "J. L. Vega",
    "A. S. Sanz",
    "S Miret-Artes"
  ],
  "comment": "32 pages, 7 figures",
  "journal": "J. Phys.: Condens. Matter 19, 305002 (2007)",
  "doi": "10.1088/0953-8984/19/30/305002",
  "categories": [
    "cond-mat.stat-mech",
    "cond-mat.mtrl-sci",
    "quant-ph"
  ],
  "abstract": "The 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.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2007-07-16T14:53:24.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "stochastic description",
      "interacting adsorbates",
      "atom scattering",
      "quasielastic",
      "low frequency vibrational motions"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "Journal of Physics Condensed Matter",
      "year": 2007,
      "month": "Aug",
      "volume": 19,
      "number": 30,
      "pages": 305002
    },
    "note": {
      "typesetting": "TeX",
      "pages": 32,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2007JPCM...19D5002M"
    }
  }
}