Abstract
High-frequency capillary waves at a liquid gallium surface have been studied by means of quasi-elastic light-scattering spectroscopy. The observed frequencies and damping constants of waves differed greatly from the classical theoretical treatment of a liquid Ga surface as that of a simple liquid. This effect was explained in terms of the presence of the surface layer, possessing visco-elastic properties which were, in turn, extracted, for the first time, from the fit of experimental spectra with an appropriate theoretical form. A negative value of the surface dilational viscosity has been derived for all wavenumbers studied and the effect of the visco-elasticity on the strong coupling and mixing between the capillary and dilational mode on the surface of liquid Ga has been demonstrated.
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