We have observed and measured as a function of scattering angle (0.33^∘<~<~3^∘) the spectrum of light scattered quasielastically from entropy fluctuations in a normal fluid (toluene), using a laser light source and a high-sensitivity optical heterodyne spectometer. The magnitude and angular dependence of the linewidth are in excellent agreement with the predictions of the Leontovitch-Landau-Placzek theory.
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Lastovka et al. (1966) studied this question.
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