We have used ellipsometry to measure adsorption isotherms of C2Cl2F4 (1,1,2,2-tetrafluoro-1,2-dichloroethane) on a highly ordered pyrolytic graphite (HOPG) substrate in the temperature range from 98 to 185 K. Below the triple point temperature T t = 179.2 K, the system shows incomplete wetting. Above the bulk triple point, the isotherms show layer-by-layer growth in agreement with the Frenkel−Halsey−Hill model and consistent with complete wetting.

Liquid Ar submonolayers physisorbed on graphite have been studied by ellipsometry. The layers have been evaporated by means of laser pulses and the time evolution of the coverage upon readsorption has been studied as a function of temperature (T

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