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.
@article{arxiv.cond-mat/0412103,
title = {Pairing Interactions and Gibbs Adsorption at the Liquid Bi-In Surface: A Resonant X-Ray Reflectivity Study},
author = {Elaine DiMasi and Holger Tostmann and Oleg G. Shpyrko and Patrick Huber and Benjamin M. Ocko and Peter S. Pershan and Moshe Deutsch and Lonny E. Berman},
journal= {arXiv preprint arXiv:cond-mat/0412103},
year = {2007}
}
Comments
11 pages, 2 figures, 2 tables, published in Phys. Rev. Lett