Modelization of surface diffusion of a molecular dimer.
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.
Romero
A H
AH
Advanced Materials Department, IPICyT, Camino a la presa San José 2055, Codigo Postal 78216, San Luis Potosí, SLP, Mexico.
Lacasta
A M
AM
Sancho
J M
JM
D055592:Biophysical Phenomena; D001703:Biophysics; D003460:Crystallization; D004058:Diffusion; D019281:Dimerization; D008962:Models, Theoretical; D008968:Molecular Conformation; D013696:Temperature