title: Model of homonuclear dimer adsorption in terms of two possible molecule orientations with respect to surface: square lattice.
abstract: A model of homonuclear dimer adsorption in terms of two possible molecule orientations with respect to the surface on a square lattice has been constructed and studied. The dimers can occupy one or two sites on the lattice. The thermodynamics of this system has been studied by transfer-matrix and Monte Carlo methods. The phase diagram has been constructed. It was shown that in the vicinity of the tricritical point the coverage as a function of chemical potential possesses a minimum. This phenomenon seems to be the common one for molecules with several ways of adsorption.
authors.affiliation: Omsk State Technical University, Omsk, Russia. fefelov_vasiliy@mail.ru
authors.forename: V F
authors.initials: VF
authors.lastname: Fefelov
authors.forename: V A
authors.initials: VA
authors.lastname: Gorbunov
authors.forename: A V
authors.initials: AV
authors.lastname: Myshlyavtsev
authors.forename: M D
authors.initials: MD
authors.lastname: Myshlyavtseva