Raman study of reorientational motion of liquid benzene

Abstract

Raman spectra of the 943 cm −1 band of liquid benzene- d 6 were measured at temperatures up to 120°C and at pressures up to 4000 bar. Rotational diffusion constants for tumbling and spinning motions were obtained from Raman band widths and NMR T 1 data. Experimental results were compared with theoretical diffusion constants computed on the basis of various models. It is found that the Hynes—Kapral—Weinberg theory gives the best prediction for the temperature and pressure dependence of the diffusion constants and for the rotational anisotropy in liquid benzene.