Abstract
Submonolayer adsorption isotherms of xenon condensed on the (0001) face of graphite are measured between 85°K and 102°K by Auger electron spectroscopy. A two-dimensional phase change 2D gas ⇄ 2D solid is emphasized. The solid phase is characterized by low energy electron diffraction. It is a two-dimensional crystal in epitaxy on the graphite. The analysis of the adsorption isotherms measured with a sensivity of 1500 of monolayer, i.e. 1010 atoms, allows to determine the integral heat of adsorption at the two-dimensional phase change (5.5 ± 0.1 kcal mole−1). We also deduced from our measurements, the binding energy of an individual atom of xenon on the (0001) face of graphite, the heat and the entropy of fusion of the two-dimensional crystal.
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