Experimental determination of the refractivity virial coefficients of atomic gases
Experimental determination of the refractivity virial coefficients of atomic gases
复制标题
原子气体折射率维里系数的实验测定
DOI：
10.1063/1.464212
复制
发表时间：
1993
影响因子：
4.4
通讯作者：
M. Slaman
中科院分区：
文献类型：
--
作者：
H. Achtermann;J. G. Hong;G. Magnus;R. A. Aziz;M. Slaman
用最近改进的差分干涉技术高精度地测量了原子气体He、Ne、Ar、Kr和Ar的第二维里系数BR。该装置基本上由两个耦合光栅干涉仪组成。其中一个干涉仪有两个串联的类似单元，差分测量密度的高阶效应，而第二个干涉仪有两个并联的类似单元，同时测量折射率的绝对值。在研究的压力范围内（高达40 MPa），第三个电子活度维里系数CR成为显着的气体Ar，Kr，和Ar，和第四电子活度维里系数DR成为显着的Ar。我们的实验BR和基于经典偶极诱导偶极模型的理论预测之间的协议是相当不错的Ar，Kr，和氘，但穷人的He和Ne。然而，对于He和Ne，当半经典近似时，得到了很好的一致性。
Values of the second refractivity virial coefficients BR of the atomic gases He, Ne, Ar, Kr, and Xe have been measured with a recently improved differential‐interferometric technique to a high degree of accuracy. This device basically consists of two coupled grating interferometers. One interferometer, with two similar cells in series, measures differentially the higher‐order effects of density while the second interferometer, with two similar cells in parallel, simultaneously measures the absolute value of the refractive index. In the range of pressure investigated (up to 40 MPa), the third refractivity virial coefficient CR becomes significant for the gases Ar, Kr, and Xe and the fourth refractivity virial coefficient DR becomes significant for Xe. The agreement between our experimental BR and the theoretical prediction based on the classical dipole–induced‐dipole model is fairly good for Ar, Kr, and Xe but poor for He and Ne. For He and Ne, however, good agreement is obtained when a semiclassical appro...