Abstract

The Rayleigh linewidth $\ensuremath{\Gamma}$ of isobutyric acid in water has been measured by means of signal correlation at the critical solution concentration between 0.003 and 30\ifmmode^\circ\else\textdegree\fi{}C above the critical mixing temperature ${T}_{c}$ over a range of scattering angles $\ensuremath{\theta}$ varying from 20\ifmmode^\circ\else\textdegree\fi{} to 140\ifmmode^\circ\else\textdegree\fi{}. The results are analyzed according to the mode-mode coupling theory of Kawasaki in the $K\ensuremath{\rightarrow}0$ limit, and at $K\ensuremath{\xi}\ensuremath{\gg}1$.

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