Two-bath model for activated surface diffusion of interacting adsorbates

Details Two-bath model for activated surface diffusion of interacting adsorbates Two-bath model for activated surface diffusion of interacting adsorbates

2008-10-10

arxiv.org/abs/0810.1826v2

J. Chem. Phys. 132, 054704 (2010)

Physics

Condensed Matter

Statistical Mechanics

7 pages, 3 figures

Scientific paper

10.1063/1.3299729

The diffusion and low vibrational motions of adsorbates on surfaces can be well described by a purely stochastic model, the so-called interacting single adsorbate model, for low-moderate coverages (\theta \lesssim 0.12). Within this model, the effects of thermal surface phonons and adsorbate-adsorbate collisions are accounted for by two uncorrelated noise functions which arise in a natural way from a two-bath model based on a generalization of the one-bath Caldeira-Leggett Hamiltonian. As an illustration, the model is applied to the diffusion of Na atoms on a Cu(001) surface with different coverages.

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