Depolarized Rayleigh spectroscopy studies of orientational relaxation in solutions of the xylenes

Abstract

Depolarized Rayleigh spectroscopy measurements of orientational relaxation of the three xylenes in solution are presented. The viscosity dependences of the single molecule reorientation times are obtained from the directly measured collective reorientation times by varying the solution concentration. It is found that within experimental error all three xylenes have the same single particle reorientation time viscosity dependence. Values of the effective static and dynamic correlation factors are, however, quite different for the three xylenes. Studies of the para-xylene-CBr₄ complex are also presented.