Rayleigh Ratio for Benzene and Its Temperature Dependence

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Abstract
The temperature dependence of the Rayleigh ratio for benzene was studied for the purpose of comparing various reported values obtained at different temperatures with each other. The following relationship was obtained for a wavelength of incident light of λ0=435.8 nm: R 90=(0.1377t+43.06)×10−6cm−1 where t is temperature (°C). Light-scattering photometers were calibrated with benzene purified by a preparative gas chromatograph by using a value of the Rayleigh ratio for benzene of R90=46.5×10−6cm−1 (25 °C, λ0=435.8 nm). In order to verify the validity of the calibrations, molecular weight determinations were run on three standard substances: egg white lysozyme, raffinose, and sucrose. The temperature of benzene was directly measured by inserting the sensor of a thermistor thermometer into the benzene within the cell.

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