期刊名称：Proceedings of the National Academy of Sciences
印刷版ISSN：0027-8424
电子版ISSN：1091-6490
出版年度：1999
卷号：96
期号：23
页码：13009-13011
DOI：10.1073/pnas.96.23.13009
语种：English
出版社：The National Academy of Sciences of the United States of America
摘要：We report the results of x-ray reflectivity and grazing incidence x-ray diffraction studies of the liquid-vapor interface of a dilute alloy of Pb in Ga over the temperature range of 23-76{degrees}C. Our data show that the liquid-vapor interface of this alloy is stratified for several atomic diameters into the bulk liquid and that a monolayer of Pb forms the outermost stratum of the interface. Over the temperature range of 23-56{degrees}C, the monolayer of Pb is in an ordered hexagonal phase. At about 58{degrees}C, this monolayer undergoes a first-order transition to a hexatic phase, which remains stable to 76{degrees}C. An analogy between the observed transition and the first-order melting transition in a one-component classical plasma is suggested.
