Diffusion of Particles Adsorbed on a Patchwise Surface

摘要

The diffusion of particles adsorbed on a patchwise surface with two non-equivalent sites is investigated in the framework of the lattice-gas model. The coverage dependencies of the center-of-mass and Fickian diffusion coefficients are calculated for some representative values of the lateral interaction. We propose the analytical expressions for the diffusion coefficients. We compare the the-oretical dependencies with the numerical data obtained by the kinetic Monte Carlo simulations. The good coincidence of the data obtained by the two quite different methods corroborates strongly the approach developed to describe the particle migration on such complex, heterogeneous lattices.