Stochastic theory of lineshape broadening in quasielastic He atom scattering with interacting adsorbates
arXiv:0710.3266 · doi:10.1103/PhysRevB.77.115414
Abstract
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.
arXiv comment6 pages, 3 figures
References in corpus (5)
- Line Shape Broadening in Surface Diffusion of Interacting Adsorbates with Quasielastic He Atom Scattering
- Surface diffusion and low vibrational motion with interacting adsorbates: A shot noise description
- Quasielastic He atom scattering from surfaces: A stochastic description of the dynamics of interacting adsorbates
- A generalized Chudley-Elliott vibration-jump model in activated atom surface diffusion
- Quasi-elastic peak lineshapes in adsorbate diffusion on nearly flat surfaces at low coverages: the motional narrowing effect in Xe on Pt(111)
Cited by in corpus (5)
- Linear response theory of activated surface diffusion with interacting adsorbates
- Quantum Markovian activated surface diffusion of interacting adsorbates
- Two-bath model for activated surface diffusion of interacting adsorbates
- Quantum surface diffusion in Bohmian Mechanics
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