Determination of the density profile in the liquid–vapor interface near the triple point
- 15 June 1978
- journal article
- research article
- Published by AIP Publishing in The Journal of Chemical Physics
- Vol. 68 (12) , 5558-5567
- https://doi.org/10.1063/1.435685
Abstract
The density profile in the transition region between liquid and vapor Hg has been determined, at room temperature, from a study of the angular dependence of the reflection of Cr Kα x rays. This profile ρ (Z) has a hyperbolic tangent form with width L=5.6±0.5 Å, where L≡−(ρ L −ρ G )[dρ (Z)/d Z]−1 Z=0, with ρ L and ρ G the densities of liquid and vapor, respectively. The nature of the profile and the value of L are compared with the corresponding quantities obtained from computer simulations of the surface of liquid Ar. For liquidHg,L is dominated by a static structural contribution fundamentally traceable to the nonzero wavelength of the electrons and their influence on the effective ion–ion potential. For liquid Ar, L is dominated by the contribution from thermal motion. The currently available theory of the liquid metalsurfacetransition zone predicts a value for L which is too small by a factor of 2. This discrepancy, the role of surface capillary waves in broadening the transition zone, and the possible relationship of the structure of the transition zone to the stability of the liquid are discussed.Keywords
This publication has 41 references indexed in Scilit:
- On the existence of a nonmonotonic nuclear density profile at the jellium–vacuum interfaceThe Journal of Chemical Physics, 1977
- Structure of a liquid-vapor interfaceJournal of Statistical Physics, 1977
- Model for density variation at a fluid surfaceJournal of Statistical Physics, 1976
- Surface reflectance spectroscopy studies of chemisorption on W(100)Physical Review B, 1974
- Critical Liquid-Vapor Interface in S. I. Thickness of the Diffuse Transition LayerPhysical Review A, 1973
- Statistical Mechanical Calculation of the Density Variation through a Liquid—Vapor InterfaceThe Journal of Chemical Physics, 1972
- Low-Energy Electron Diffraction Studies of Liquid Lead, Bismuth, and Tin SurfacesThe Journal of Chemical Physics, 1970
- Statistical-Mechanical Calculation of Surface Properties of Simple Liquids and Liquid Mixtures. I. Pure LiquidsThe Journal of Chemical Physics, 1968
- Optical Measurements on Liquid Metals Using a New EllipsometerJournal of the Optical Society of America, 1968
- Surface Studies of Solids by Total Reflection of X-RaysPhysical Review B, 1954