Abstract
The profile of the 992 cm −1 Raman line of benzene is studied as a function of temperature and of concentration in solution with CCl 4. The results confirm that tumbling motions of the C 6H 6 molecule in the pure liquid are in the rotational diffusion limit. Upon dilution with CCl 4, these motions approach the free rotor limit. Additional support is found for the view that an unusal vibrational relaxation mechanism operates in C 6H 6C 6H 6 collisions.
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