Pairing Interactions and Gibbs Adsorption at the Liquid Bi-In Surface: A   Resonant X-Ray Reflectivity Study
  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. 
Elaine DiMasi, Holger Tostmann, Oleg G. Shpyrko, Patrick Huber,   Benjamin M. Ocko, Peter S. Pershan, Moshe Deutsch and Lonn...