Diffusion of atoms interacting by long-range and oscillating forces

Details Diffusion of atoms interacting by long-range and oscillating forces Diffusion of atoms interacting by long-range and oscillating forces

2009-05-25

arxiv.org/abs/0905.4025v1

Physics

Condensed Matter

Materials Science

9 pages, 7 figures

Scientific paper

Collective diffusion coefficient in a one dimensional lattice gas adsorbate is calculated using variational approach. Particles interact via either a long-range, or a long range electron-gas-mediated (for a metallic substrate), or a Lennard-Jones interaction. Diffusion coefficient as a function of the adsorbate density strongly depends on the relationship between the substrate lattice constant and the characteristic length of the inter--particle interaction potential (which determines positions of the potential energy minima). The diffusion coefficient at fixed density as a function of the interaction characteristic length has an oscillating character due to the interplay between the inter--particle distances allowed by the substrate lattice structure and the average inter--particle distances which minimize the total interaction energy.

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