Abstract
The wetting behavior of ${\mathrm{H}}_{2}$ films adsorbed on silver was studied with a quartz-crystal microbalance. Below the triple-point temperature ${T}_{t}$, incomplete-wetting films are observed, while above it the liquid films completely wet the substrate. Within the experimental resolution the wetting transition occurs at ${T}_{t}$. The maximum frequency change at saturation (which corresponds to the film thickness at saturation) increases as the temperature approaches ${T}_{t}$, obeying a power law of the form \ensuremath{\Delta}${f}_{0}$\ensuremath{\propto}${t}^{\mathrm{\ensuremath{-}}1/n}$, with n=3.28\ifmmode\pm\else\textpm\fi{}0.3 and t=(${T}_{t}$-T)/${T}_{t}$. The shape of the isotherms suggests the presence of two-phase films above and below the triple point.
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