Comparison Between Single Particle and Collective Reorientation Times

12 3 COMPARISON BETWEEN SINGLE-PARTICLE AND COLLECTIVE REORIENTATION TIMES 

In Section 12.2 we found that when R 0, the depolarized spectrum is a simple Lorent-zian 

N symmetric top molecules in the system. Substitution of dtyz = (a H - aj E iUtfyUi) 

On intuitive grounds we expect /V for a solution in which the solvent is optically isotropic and the solute is anisotropic to reduce to rs in the limit of infinite dilution. This can be checked by performing light-scattering and NMR measurements on each of a series of solutions of decreasing concentration. The intuitive notion is born out by such experiments, as we shall see. 

It should be noted that Ft and /s differ in the following respects (a) projection operators are different, (b) static correlation functions a z 2 and 2 are different, 

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