ISSN:
1089-7690
Source:
AIP Digital Archive
Topics:
Physics
,
Chemistry and Pharmacology
Notes:
The theory of island formation in chemisorption [Becker and Ben-Shaul, Phys. Rev. Lett. 61, 2859 (1988)], which treats chemisorption as a combination of direct adsorption and cluster formation, is generalized to account for the effects of cluster–cluster coalescence and of surface diffusion. The effect of cluster–cluster coalescence is approximated by series expansion in increasing "overlaps.'' Exact calculation of the second order term, which describes the two-cluster overlaps, yields a good agreement with Monte Carlo simulation results. By incorporating the surface diffusion process it is shown that upon increasing the diffusion rate (i.e., raising the surface temperature) the system changes its behavior from correlated chemisorption (cluster formation) to random chemisorption. The extended formalism includes, as specific realizations, both the case of immobile particles and the cases of rapid diffusing particles (Langmuir's and Kisliuk's models).
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.462704
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