Abstract
The depolarized Rayleigh and Raman scattering spectra of 1,2,4‐trichlorobenzene (TCB) in CCl4 have been measured as a function of concentration at several tempertures in high resolution. The depolarized Rayleigh spectra were obtained using a Fabry–Perot interferometer and the high resolution Raman spectra were obtained using a tandem spectrometer consisting of a Fabry–Perot interferometer and a double grating monochromator. The central dip due to shear wave coupling to reorientational motion is observed in the depolarized Rayleigh spectrum. The Rayleigh relaxation times τRay obtained for TCB depend on the TCB concentration. The concentration dependence of the Rayleigh times indicates the importance of orientational pair correlation in TCB. The single particle orientational relaxation times τs were obtained by extrapolating from τRay data to infinite dilution. The activation energy for molecular reorientation which is found to be affected by pair correlation decreases with decreasing concentration, with mo...
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