Determination of the density profile in the liquid–vapor interface near the triple point
Determination of the density profile in the liquid–vapor interface near the triple point
复制标题
三相点附近液-气界面密度分布的测定
DOI：
10.1063/1.435685
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发表时间：
1978
影响因子：
4.4
通讯作者：
S. Rice
中科院分区：
文献类型：
--
作者：
B. C. Lu;S. Rice
在室温下，通过研究Cr Kα x射线反射的角度依赖性，确定了液态和气态Hg之间过渡区的密度分布。该分布ρ（Z）具有双曲正切形式，宽度L=5.6±0.5 A，其中L <$−（ρL−ρG）[dρ（Z）/dZ]− 1 Z =0，ρL和ρG分别为液体和蒸汽的密度。的轮廓和L值的性质进行比较，从计算机模拟的液体Ar的表面获得相应的数量。对于液态汞，L主要是由静态结构的贡献，从根本上追溯到非零波长的电子和有效的离子-离子电位的影响。对于液态Ar，L主要由热运动的贡献决定。目前可用的液态金属表面过渡区理论预测的L值太小，为2倍。这种差异，表面毛细波在扩大过渡区的作用，以及可能的关系。
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 A, where L≡−(ρL−ρG)[dρ (Z)/dZ]−1Z=0, with ρL and ρG 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 liquid Hg, 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 metal surface transition 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 rel...