Abstract
The first rank tensor rotational relaxation time τ1R of OCS in liquid n-heptane was determined at various temperatures by isotropic Raman and infrared and was interpreted as a function of the viscosity η as well as the free volume of the solvent. The Debye–Stokes–Einstein relation provided a qualitative account of the data, although the experimental slope of τ1R vs η/T was found to be much smaller than the theoretical value. On the other hand, on the basis of a simple liquid cell model, it was established and experimentally verified that the reduced width of the orientational band contour (Δω1/2)1R (I/kT)1/2 is a linear function of the relative free volume of the solvent.
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