CRITICAL-TEMPERATURES OF 2-DIMENSIONAL CONDENSATION IN THE 1ST ADLAYER OF NOBLE-GASES ON THE CLEAVAGE FACE OF GRAPHITE

A set of adsorption isotherms of Ar on the basal face of graphite gives for the critical temperature of two-dimensional condensation in the first adlayer a value of 591 K, significantly different from that previously accepted. This value, together with those obtained for Kr and Xe, agrees well with the prediction of a virial expansion truncated after the fourth coefficient, suggesting that the liquid phases of the first monolayers of noble gases adsorbed on graphite are not significantly perturbed by the surface structure. © 1979 The American Physical Society.