CRITICAL BEHAVIOR OF THE REFRACTIVE-INDEX IN A BINARY FLUID

被引:19
作者
BEYSENS, D
WESFREID, J
机构
[1] Commissariat à l'Energie Atomique, Division de la Physique, Service de Physique du Solide et de Resonance Magnetique, 91190 Gif Sur Yvette
关键词
D O I
10.1063/1.438109
中图分类号
O64 [物理化学(理论化学)、化学物理学];
学科分类号
070304 ; 081704 ;
摘要
We have performed very accurate interferometer measurements of the refractive index n(precision ±6×10-7) in the critical mixture nitroethane-iso-octane. n depends on the density ρ and local field effects F. Even though this mixture is expected to show a very small anomaly in Δρ/ρ (exponent α) so that local field effects should have been observed, in fact we never saw a contribution due to F and the critical behavior of n is governed by the density anomaly alone. Using the matching of refractive index components and of thermal derivatives, the regular part of n can be evaluated and the value α = 0.10±0.02 is found, in agreement with the group renormalization value 0.110. The corresponding amplitude is compatible with the value obtained from ξ0 and (∂T c/∂p)V,xc measurements using universal amplitude relations. © 1979 American Institute of Physics.
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页码:119 / 123
页数:5
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