A simple model for a dimer molecular diffusion on a crystalline surface, as a function of temperature, is presented. The dimer is formed by two particles coupled by a quadratic potential. The dimer diffusion is modeled by an overdamped Langevin equation in the presence of a two-dimensional periodic potential. Numerical simulation’s results exhibit some dynamical properties observed, for example, in Si2 diffusion on a silicon  surface. They can be used to predict the value of the effective friction parameter. Comparison between our model and experimental measurements is presented.
CitationRomero, A.H; Lacasta, A.M; Sancho, J.M. Modelization of surface diffusion of a molecular dimer. "Physical Review E". vol. 69, núm. 5, p. 051105
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