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In this paper we have considered a simple lattice gas model of chemisorbedmonolayer which allows for the harmonic fluctuations of the bond length betweenthe adsorbate atom and the surface site. The model also involves a short-rangedattractive potential acting between the adsorbed atoms as well as the surfaceperiodic corrugation potential. It has been assumed that the adsorbed atoms arebonded to the uppermost layer of the substrate atoms. In particular, usingMonte Carlo simulation method we have focused on the orderings appearing in thedense monolayer formed on the (111) face of an fcc solid. Within the latticegas limit, the chemisorbed layer forms a (1x1) structure. On the other hand,when the bonds are allowed to fluctuate, three other different ordered phaseshave been found to be stable in the ground state. One of them has been found tobe stable at finite temperatures and to undergo a phase transition to thedisordered state. The remaining two ordered states have been found to be stablein the ground state only. At finite temperatures, the ordering has beendemonstrated to be destroyed due to large entropic effects.

Ordering and order-disorder phase transition in the (1x1) monolayer chemisorbed on the (111) face of an fcc crystal