Abstract
Depolarized Rayleigh and polarized and depolarized Raman spectra for the 998, 1030, 1067 and 1215 cm −1 vibrations of pyridine in water at twelve different concentrations are reported. The analysis of the data is carried out in various steps in order to illuminate the limitations of present experimental light scattering methods for investigating the orientational motion of an anisotropic rotator. The available accuracy is not sufficient to construct the complete anisotrpic rotational diffusion tensor. The interpretation of the isotropic Raman lines in terms of a stochastic modulation model, however, yields interesting results concerning the lifetime of the pyridine—water associate complexes and the influence of the environment on the vibrational relaxation of pyridine.
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