A Monte Carlo estimation of surface diffusion by simulating laser-induced thermal desorption

A current method of experimentally estimating surface diffusion is laser-induced thermal desorption (LITD). We consider the behavior of adsorbed species such as hydrogen on a (111) face-centered-cubic surface of platinum or rhodium. The diffusion coefficients for a variety of systems and surface cov...

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Bibliographic Details
Published in:The Journal of chemical physics 1990-08, Vol.93 (4), p.2871-2878
Main Authors: RAY, L. A, BAETZOLD, R. C
Format: Article
Language:English
Subjects:
Applied sciences
Condensed matter: structure, mechanical and thermal properties
Exact sciences and technology
Metals. Metallurgy
Physics
Solid surfaces and solid-solid interfaces
Surface structure and topography
Surfaces and interfaces
thin films and whiskers (structure and nonelectronic properties)
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Summary:A current method of experimentally estimating surface diffusion is laser-induced thermal desorption (LITD). We consider the behavior of adsorbed species such as hydrogen on a (111) face-centered-cubic surface of platinum or rhodium. The diffusion coefficients for a variety of systems and surface coverages are estimated by the simulation of a laser-induced thermal desorption experiment. Novel Monte Carlo methods are used that eliminate the time conversion difficulties that arise when using a standard Metropolis algorithm. In particular, the process of adsorbate hopping is determined strictly on the basis of local configurations of adsorbed particles. The results from the simulation are favorably compared to experimental data and provide estimates of the diffusion parameters for the studied systems.
ISSN:0021-9606
1089-7690
DOI:10.1063/1.458872