Stochastic theory of lineshape broadening in quasielastic He atom scattering with interacting adsorbates

Details Stochastic theory of lineshape broadening in quasielastic He atom scattering with interacting adsorbates Stochastic theory of lineshape broadening in quasielastic He atom scattering with interacting adsorbates

2007-10-17

arxiv.org/abs/0710.3266v2

Phys. Rev. B 77, 115414 (2008)

Physics

Condensed Matter

Statistical Mechanics

6 pages, 3 figures

Scientific paper

10.1103/PhysRevB.77.115414

The activated surface diffusion of interacting adsorbates is described in terms of the so-called interacting single adsorbate approximation, which is applied to the diffusion of Na atoms on Cu(001) for coverages up to 20% in quasielastic He atom scattering experiments. This approximation essentially consists of solving the standard Langevin equation with two noise sources and frictions: a Gaussian white noise accounting for the friction with the substrate, and a white shot noise characterized by a collisional friction simulating the adsorbate-adsorbate collisions. The broadenings undergone by the quasielastic peak are found to be in very good agreement with the experimental data reported at two surface temperatures 200 and 300 K.

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