Lonny E. Berman

Publications (2)7.37 Total impact

• Source

  Available from: Patrick Huber

  Article: Pairing Interactions and Gibbs Adsorption at the Liquid Bi-In Surface: A Resonant X-Ray Reflectivity Study

  Elaine DiMasi, Holger Tostmann, Oleg G. Shpyrko, Patrick Huber, Benjamin M Ocko, Peter S. Pershan, Moshe Deutsch, Lonny E. Berman
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  ABSTRACT: Resonant x-ray reflectivity measurements from the surface of liquid Bi22In78 find only a modest surface Bi enhancement, with 35 atomic % Bi in the first atomic layer. This is in contrast to the Gibbs adsorption in all liquid alloys studied to date, which show surface segregation of a complete monolayer of the low surface tension component. This suggests that surface adsorption in Bi-In is dominated by attractive interactions that increase the number of Bi-In neighbors at the surface. These are the first measurements in which resonant x-ray scattering has been used to quantify compositional changes induced at a liquid alloy surface.
  Physical Review Letters 01/2005; · 7.37 Impact Factor
• Source

  Available from: Patrick Huber

  Article: Resonant X-Ray Scattering from the Surface of a Dilute Hg-Au Alloy

  Elaine DiMasi, Holger Tostmann, Oleg G. Shpyrko, Patrick Huber, Benjamin M Ocko, Peter S. Pershan, Moshe Deutsch, Lonny E. Berman
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  ABSTRACT: We 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 LIII 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. Comment: 6 pages, 4 figures, published in Materials Science V Vol. 590
  12/2004;