Surface diffusion of dimers: I repulsive interactions

A.J. RAMIREZ-PASTOR; M. S. NAZZARRO; J.L. RICCARDO; V. PEREYRA

SURFACE SCIENCE

Elsiever

Año: 1997 vol. 391 p. 267 - 277

0039-6028

We analyze the diffusion process of rigid homonuclear dimers (AA) adsorbed on a simple cubic (sc(100)) surface. The coverage dependence of the collective diffusion coefficient is obtained by means of Monte Carlo simulations in the framework of the Kubo Green formalism. Different microscopic diffusion mechanisms are introduced and their influence in the collective motion havebeen investigated. Repulsive adsorbate adsorbate interaction, JAA, is considered in order to analyze the influence of such parameter on the diffusion process. The behavior of the diffusion coefficient in the critical region is studied, where several ordered adsorbate structures appear depending on the values of JAA. ~ 1997 Elsevier Science B.V.