Abstract
The properties of localized monolayers formed on a square lattice with randomly distributed sites of different adsorption energies are studied with the help of Monte Carlo computer simulations. The effects of random impurities on phase transitions in adsorbed layers are discussed. It is demonstrated that the commonly used approaches to adsorption on heterogeneous surfaces, based on mean field theories, are valid only at very high temperatures. In the region of low temperatures, below the critical two-dimensional temperature of an adsorbate, the predictions of mean field theories seriously underestimate the heterogeneity effects on phase transitions in adsorbed layers.
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