Abstract
A technique has been developed to modify the composition of sessile drops in situ under ultra-high vacuum conditions. This technique has been used to study the surface energies of single-phase Ga-rich Ga–Pb liquids as a function of the Pb atom fraction over the range from 3.6×10 −5 to 1.5×10 −2, and over the temperature interval from 350 to 670 K. Isotherms of surface energy versus Pb chemical potential were found to display a transition between regimes of low and high Pb adsorption. The locus of the compositions and temperatures of the transition points were used to estimate a prewetting critical point for the Ga–Pb system of 260±70 K.
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