Abstract
The doublet in the depolarized ( I HV) Rayleigh light scattering spectrum was studied in the isotropic phase of p-methoxybenzylidene-( p-n-butyl)aniline and in the n-alkanes n-hexadecane and n-docosane. All spectra were found to fit well to the Andersen-Pecora theory of the I HV spectrum in viscous liquids. The values of the coupling parameter R were determined to be 0.36 for MBBA, 0.33 for n-hexadecane and 0.38 for n-docosane. A direct correspondence is made between the parameters of the Andersen-Pecora theory and the phenomenological theory of de Gennes. Using the measured value of R and a microscopic definition of de Gennes' “ a” parameter we obtain values for the viscosity parameters ν and μ in MBBA. A comparison of the present results on n-alkanes is made to previous studies of the depolarized Rayleigh spectrum by Champion and Jackson.
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