Collective and tracer diffusion in low-coverage adsorbates

Ferrando, R, Scalas, Enrico and Torri, M (1993) Collective and tracer diffusion in low-coverage adsorbates. Journal of Electron Spectroscopy and Related Phenomena, 64-65. pp. 813-818. ISSN 0368-2048

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In the present paper both the self (or tracer) diffusion coefficient Ds and the chemical (or collective) diffusion coefficient Dc are computed for the Ising-Peierls lattice gas with nearest-neighbour interactions as functions of coverage θ. The two quantities are calculated in the framework of the Mori projection-operator formalism. Here Ds and Dc are studied for coverages up to and memory effects are neglected. It turns out that at low lateral coupling Ds depends on coverage more strongly than Dc. The collective diffusion coefficient is more sensitive to the increase oflateral interactions than the self diffusion coefficient. In the range of coverages under investigation, Dc is an increasing function of θ in the repulsive case, whereas, if attractive interactions are present, it decreases as θ increases. The theoretical results given by different choices of the jump dynamics are shown and briefly discussed.

Item Type: Article
Schools and Departments: School of Mathematical and Physical Sciences > Mathematics
Subjects: Q Science > QA Mathematics > QA0273 Probabilities. Mathematical statistics
Q Science > QC Physics > QC0170 Atomic physics. Constitution and properties of matter Including molecular physics, relativity, quantum theory, and solid state physics
Depositing User: Enrico Scalas
Date Deposited: 03 Oct 2014 13:36
Last Modified: 29 Jul 2019 09:17
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