Romero, A. H.Lacasta Palacio, Ana MaríaSancho, José M.2011-07-072011-07-0720041063-651Xhttps://hdl.handle.net/2445/18764A 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 [100] surface. They can be used to predict the value of the effective friction parameter. Comparison between our model and experimental measurements is presented.4 p.application/pdfeng(c) The American Physical Society, 2004Física estadísticaTermodinàmicaSistemes dinàmics diferenciablesMatèria condensadaStatistical physicsThermodynamicsDifferentiable dynamical systemsCondensed matterinfo:eu-repo/semantics/article517455info:eu-repo/semantics/openAccess