Molecular diffusion in monolayer and submonolayer nitrogen - art. no. 045413

The orientational and translational motions in a monolayer fluid of physiso rbed molecular nitrogen are treated using molecular dynamics simulations. D ynamical response functions and several approximations to the coefficient o f translational diffusion are determined for adsorption on the basal plane surface of graphite and on a fictitious uncorrugated graphite surface. The rotational diffusion constants in the plastic crystal and in the fluid phas e are calculated. The possibility of observing these phenomena with quasiel astic scattering experiments is discussed. The wave vector range is determi ned where the ballistic approximation to the translational molecular self-c orrelation function is accurate.