Statistical mechanics of the Xe/Ag(111) monolayer

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Abstract
Calculations are reported of properties of solid and fluid phases of the Xe/Ag(111) monolayer. The thermal expansion of the solid at its sublimation curve is calculated and the monolayer triple point is estimated. Anharmonic effects in the solid are discussed and mean field approximations to the adsorption dipoles in the dense fluid are introduced. The interaction model reproduces the low temperature properties of the monolayer solid, but there are small departures from the experimental data for the thermal expansion above 60 K. The calculated triple point temperature is significantly lower than the values reported for other monolayer xenon systems.