An investigation was made of the diffusion of particles adsorbed on a triangular lattice having both deep and shallow sites. It was shown that the nature of the particle migration depended substantially upon the relative jump rates from the deep and shallow sites. The site inhomogeneity imposed a correlation between successive jumps. That is, particles performed pairs of slow and fast jumps.

General analytical expressions were derived for the chemical and jump diffusion coefficients. Coverage dependences of the diffusion coefficients, and of some thermodynamic quantities, were calculated for various lateral interactions between the particles. The analytical data were compared with the numerical data obtained from kinetic Monte Carlo simulations. The agreement between the results obtained using the quite different approaches was very satisfactory.

Diffusion of Particles over Triangular Inhomogeneous Lattice with Two Non-Equivalent Sites. A.Tarasenko, L.Jastrabik: Physica A, 2009, 388[11], 2109-21