DiMasi, E.Tostmann, H.Ocko, B. M.Huber, P.Shpyrko, O. G.Pershan, PeterDeutsch, M.Berman, L. E.2010-09-012000DiMasi, E., H. Tostmann, B. M. Ocko, P. Huber, O. G. Shpyrko, Peter S. Pershan, M. Deutsch, and L. E. Berman. 2000. Resonant x-ray scattering from the surface of a dilute liquid Hg-Au alloy. In Applications of synchrotron radiation techniques to materials science V: Symposium: November 29, 1999 - December 3, 1999, Boston, Massachusetts, ed. S. H. Stock, S. M. Mini, and D. L. Perry. Warrendale, PA: Materials Research Society.155899498X9781558994980http://nrs.harvard.edu/urn-3:HUL.InstRepos:4419625We present the first resonant x-ray reflectivity measurements from a liquid surface. The surface structure of the liquid Hg-Au alloy system just beyond the solubility limit of 0.14at% Au in Hg had previously been shown to exhibit a unique surface phase characterized by a low-density surface region with a complicated temperature dependence. In this paper we present reflectivity measurements near the Au LII1 edge, for 0.2at% Au in Hg at room temperature. The data are consistent with a concentration of Au in the surface region that can be no larger than about 30at%. These results rule out previous suggestions that pure Au layers segregate at the alloy surface.en-USMonograph or Book10.1557/PROC-590-183