X-ray Reflectivity Studies of Liquid Metal and Alloy Surfaces

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X-ray Reflectivity Studies of Liquid Metal and Alloy Surfaces

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dc.contributor.author Regan, M. J.
dc.contributor.author Pershan, Peter S.
dc.contributor.author Magnussen, O. M.
dc.contributor.author Ocko, B. M.
dc.contributor.author Deutsch, M.
dc.contributor.author Berman, L. E.
dc.date.accessioned 2010-09-01T14:34:17Z
dc.date.issued 1997
dc.identifier.citation Regan, M. J., Peter S. Pershan, O. M. Magnussen, B. M. Ocko, M. Deutsch, and L. E. Berman. 1997. X-ray reflectivity studies of liquid metal and alloy surfaces. Physical Review B 55(23): 15874–15884. en_US
dc.identifier.issn 1098-0121 en_US
dc.identifier.uri http://nrs.harvard.edu/urn-3:HUL.InstRepos:4419623
dc.description.abstract Surface-induced atomic layering at the liquid/vapor interface in liquid metals has been observed using x-ray reflectivity on sputtered clean surfaces under ultrahigh vacuum conditions. A well-defined quasi-Bragg peak is obtained for surfaces of elemental Ga and a Ga-In alloy at large wave vectors qz∼2.3–2.5 Å-1. These results are an unambiguous indication of atomic layering with an interlayer spacing d∼2π/qz=2.5–2.7 Å. For liquid Ga, the amplitude of the electron-density oscillations, which is significantly underestimated by existing theory and molecular simulation, decays with a characteristic length of 6 Å, which is twice that of Hg. Results on the alloy show a clear enrichment of indium at the topmost surface layer, consistent with the Gibbs adsorption rule. The enrichment consists of a single monolayer, with subsequent layers at the bulk eutectic composition. In order to suppress mechanically excited surface waves, the measurements were performed on thin liquid metal films (<0.5 mm deep), which leads to a macroscopically curved surface due to the large surface tensions in liquid metals. The experimental challenges posed by measurements on curved surfaces and the techniques that were developed are discussed in detail. en_US
dc.description.sponsorship Engineering and Applied Sciences en_US
dc.language.iso en_US en_US
dc.publisher American Physical Society en_US
dc.relation.isversionof doi:10.1103/PhysRevB.55.15874 en_US
dc.relation.hasversion http://liquids.seas.harvard.edu/peter/old.pdf/metal_8.pdf en_US
dash.license META_ONLY
dc.title X-ray Reflectivity Studies of Liquid Metal and Alloy Surfaces en_US
dc.type Journal Article en_US
dc.description.version Version of Record en_US
dc.relation.journal Physical Review -Series B- en_US
dash.depositing.author Pershan, Peter S.
dash.embargo.until 10000-01-01

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  • FAS Scholarly Articles [7456]
    Peer reviewed scholarly articles from the Faculty of Arts and Sciences of Harvard University

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