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  • Title: Microscopic structure of the wetting film at the surface of liquid Ga-Bi alloys.
    Author: Tostmann H, DiMasi E, Shpyrko OG, Pershan PS, Ocko BM, Deutsch M.
    Journal: Phys Rev Lett; 2000 May 08; 84(19):4385-8. PubMed ID: 10990692.
    Abstract:
    X-ray reflectivity measurements of the binary liquid Ga-Bi alloy reveal a dramatically different surface structure above and below the monotectic temperature T(mono) = 222 degrees C. A Gibbs-adsorbed Bi monolayer resides at the surface in both regimes. However, a 30 A thick, Bi-rich wetting film intrudes between the Bi monolayer and the Ga-rich bulk for T>T(mono). The wetting film's internal structure, not hitherto measured, is determined with A resolution, showing a concentration gradient not predicted by theory and a highly diffuse interface with the bulk phase.
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