Kawasaki-Einstein-Stokes Formula and Dynamical Scaling in the Critical Region of a Binary Liquid Mixture: Isobutyric Acid in Water

Abstract

The Rayleigh linewidth $\Gamma$ of isobutyric acid in water has been measured by means of signal correlation at the critical solution concentration between 0.003 and 30°C above the critical mixing temperature $T_c$ over a range of scattering angles $\theta$ varying from 20° to 140°. The results are analyzed according to the mode-mode coupling theory of Kawasaki in the $K\to 0$ limit, and at $K\xi \gg 1$.