The Simplest Model of Multisite Adsorption of Molecules with Different Orientation in Adlayer

摘要

Model of homonuclear dimer adsorption in terms of two possible molecule orientations with respect to surface on square, triangular and honeycomb lattices was constructed and studied. The dimers can occupy one site or two sites on the lattice. The thermodynamics of the adsorbed overlayer was studied by transfer-matrix and Monte Carlo methods. The phase diagrams were also obtained. It was shown that in such systems the coverage as function of chemical potential may be nonmonotonic. This phenomenon seems to be the common one for molecules with several ways of adsorption.