Abstract
IR absorption and Raman scattering bandwidths of some fundamental modes of A 1, B 1 and B 2 species of furan and thiophene and their temperature dependence have been studied. This analysis has been carried out on the pure liquid phase. Rotational A, bandwidths are directly obtained. Rotational B 1 and B 2 bandwidths are deduced by using the Rakov model. The same activation energy U accounts for all the results concerning the reorientations around the three principal axes of inertia. The rotational diffusion coefficients D x,D y and D z are then deduced from the rotational IR bandwidths. The results allow us to conclude that quasi isotropic molecular rotations occur in the liquid phase.
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