title: Modelization of surface diffusion of a molecular dimer.
abstract: 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 [100] surface. They can be used to predict the value of the effective friction parameter. Comparison between our model and experimental measurements is presented.
authors.affiliation: Advanced Materials Department, IPICyT, Camino a la presa San José 2055, Codigo Postal 78216, San Luis Potosí, SLP, Mexico.
authors.forename: A H
authors.initials: AH
authors.lastname: Romero
authors.forename: A M
authors.initials: AM
authors.lastname: Lacasta
authors.forename: J M
authors.initials: JM
authors.lastname: Sancho
mesh_terms: D055592:Biophysical Phenomena; D001703:Biophysics; D003460:Crystallization; D004058:Diffusion; D019281:Dimerization; D008962:Models, Theoretical; D008968:Molecular Conformation; D013696:Temperature