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The Combinatorial Factor Method for Investigation of Surface Adsorption

S. Ranjbar

Department of Chemistry, Razi University, Kermanshah, Iran

In this work, we have used the combinatorial factor method to find the thermodynamic properties of the monolayer surface adsorption with a limited number of rows and nearest neighbor interactions so that the maximum coordination number of each adsorbed particle could be varied from zero to four. The results show that the thermodynamic properties of models with different number of rows are close to each other. In addition, for adsorbed particles with the nearest neighbor interactions, when the fractional coverage becomes 1/2, a phase transition takes place.

Keywords: Ising model, Combinatorial factor, Phase transition, Surface adsorption