Two-bath model for activated surface diffusion of interacting adsorbates

摘要

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