In this paper we report an extensive study of the relevant static and dynamic parameters connected to microscopic order and reorientational motion of single molecules in liquid-crystalline mesophases. In particular, we have studied the temperature dependence of the second- and fourth-order parameters 〈P₂〉 and 〈P₄〉, and of the spinning and tumbling diffusion coefficients D?ʳ and D_⊥ʳ in the nematic phase of several mesogens; some smectic phases were studied also. These results were obtained using a combined theoretical-experimental method newly developed by us, which allows the simultaneous determination of both static and dynamic parameters from the study of Raman and infrared band shapes by Fourier-transform analysis. The results are discussed in the framework of reorientational diffusion processes in anisotropic potentials. Implications on the nature of the nematic-isotropic phase transition are also given.
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Fontana et al. (1986) studied this question.
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