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The temperature dependence of surface tension \gamma(T) at liquid gallium isstudied theoretically and experimentally using light scattering from capillarywaves. The theoretical model based on the Gibbs thermodynamics relates thetemperature derivative of \gamma to the surface excess entropy -\Delta S.Although capillary waves contribute to the surface entropy with a positive signthe effect of dipole layer on \Delta S is negative. Experimental data collectedat a free Ga surface in the temperature range from 30 to 160 C show that thetemperature derivative of the tension changes sign near 100 C.Comment: 11 pages, 1 Postscript figure, submitted to J. Phys.

Anomalous temperature dependence of the surface tension and capillary waves at a liquid-gallium surface