E. M. Hammonds, P. Heiney, P. W. Stephens, R. J. Birgeneau, and P. Horn, J. Phys. C: Solid State Physics 13, L301-306 (1980).
An x-ray scattering study of xenon physi-adsorbed onto the (0001) surfaces of graphite is reported. Coverages between 0.3 and 2.0 monolayuers are examined and unambiguous evidence is obtained for the existence of a 2D triple point at 99 K. Above 99 K incommensurate monolyaer solid and liquid phases are observed. The liquid is well described by an exponential droplet model.
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