Phys. Rev. Lett. 84, 4385–4388 (2000)Microscopic Structure of the Wetting Film at the Surface of Liquid Ga-Bi AlloysReceived 12 July 1999; published in the issue dated 8 May 2000 X-ray reflectivity measurements of the binary liquid Ga-Bi alloy reveal a dramatically different surface structure above and below the monotectic temperature Tmono = 222°C. A Gibbs-adsorbed Bi monolayer resides at the surface in both regimes. However, a 30Å thick, Bi-rich wetting film intrudes between the Bi monolayer and the Ga-rich bulk for T>Tmono. The wetting film's internal structure, not hitherto measured, is determined with Å resolution, showing a concentration gradient not predicted by theory and a highly diffuse interface with the bulk phase. © 2000 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.84.4385
DOI:
10.1103/PhysRevLett.84.4385
PACS:
68.10.-m, 61.10.-i, 61.25.Mv, 68.45.Gd
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