Abstract
From Rayleigh linewidth and intensity studies by means of quasielastic light scattering, we report a diffusion coefficient of the form $D=d{[(\frac{T}{{T}_{P}})\ensuremath{-}1+{t}_{\ensuremath{\Gamma}}]}^{{\ensuremath{\gamma}}^{*}}$ for solutions of isobutyric acid in water in the neighborhood of the critical solution concentration. While $d$ and ${\ensuremath{\gamma}}^{*}(\ensuremath{\cong}\frac{2}{3})$ remain constant within the concentration range of our investigation, ${t}_{\ensuremath{\Gamma}}$ depends upon concentration and vanishes at the critical solution concentration. Our results are discussed in terms of the critical-point exponents.
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