Light Scattering of Water, Deuterium Oxide, and Other Pure Liquids

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Abstract
The Rayleigh ratio and the Cabannes factor for water, deuterium oxide, and a number of other pure liquids were determined at 25°C, at angles of observation ranging from 30° to 150°, at 546 and 436 mμ. It was found that the Rayleigh ratio of water is substantially lower than the values reported in the literature; the values found by us Ru 546(90)=0.865 10−6 cm−1, Ru 436(90)=2.32 10−6 cm−1 for H2O, and Ru 436(90)=0.843×10−6 cm−1, Ru 436(90)=2.30 10−6 cm−1 for D2O are in excellent agreement with the predictions of the Einstein density‐fluctuation theory, modified by the Cabannes anisotropy factor. The temperature dependence of the Rayleigh ratios for H2O and D2O is also satisfactorily predicted by the variation of the bulk parameters appearing in the Einstein—Cabannes equations. In contradistinction to such liquids as benzene, the Rayleigh ratios of H2O and D2O have a minimum, at about 22° and 28°C, respectively. No significant new information on the structure of water as a function of temperature can be derived from light‐scattering experiments.

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