Light Scattering in an Impure Binary Liquid Mixture Near the Critical Point

Abstract

Light-scattering measurements were made in a ternary critical mixture of phenol and water with hypophosphorous acid as an impurity. The exponents which characterize the divergence of the intensity and inverse linewidth near the critical point are found to have nearly the same value in this system as in pure phenol-water. In addition it was observed that the light-scattering cross section and the inverse linewidth were appreciably larger in the impure system than in the pure one. Some of the experimental results are compared with theory.