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Collective and tracer diffusion in low-coverage adsorbates

journal contribution
posted on 2023-06-08, 18:28 authored by R Ferrando, Enrico Scalas, M Torri
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 ?. 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 ? in the repulsive case, whereas, if attractive interactions are present, it decreases as ? increases. The theoretical results given by different choices of the jump dynamics are shown and briefly discussed.

History

Publication status

  • Published

Journal

Journal of Electron Spectroscopy and Related Phenomena

ISSN

0368-2048

Publisher

Elsevier

Volume

64-65

Page range

813-818

Department affiliated with

  • Mathematics Publications

Full text available

  • No

Peer reviewed?

  • Yes

Legacy Posted Date

2014-10-03

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