Abstract
A high-resolution Raman—Rayleigh spectrometer is described involving a coupled grating monochromator and a Fabry—Pérot interferometer allowing the accurate measurement of very narrow Raman bandshapes and depolarized Rayleigh spectra. The method was applied to the determination of the reorientational motion of liquid benzene, toluene and the phenyl group in polystyrene and polymethylphenylsiloxane. The Raman reorientation times obtained differ in some instances significantly from previously published results. The possibilities and limitations of using Raman linewidth measurements in complex liquids are discussed.
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