We have used molecular-dynamics simulations to study the structure and mobility of n-
butane adlayers on Pt (111). Simulations were performed with a united-atom model of n-
butane for adlayer coverages ranging from the submonolayer to the multilayer regime. At
submonolayer coverages, n-butane molecules adsorb with their molecular plane parallel to
the surface. Upon increasing coverage close to a monolayer, some of the molecules form a
tilted structure with their long axes oriented away from the surface. The in-plane ordering of …