Abstract
In this Chapter we review the application of Raman and infrared fluctuation spectroscopy to the study of molecular reorientational dynamics in aligned nematic phases of liquid-crystalline systems. From lineshape Fourier analysis of selected vibrational bands it is possible, in favourable cases, to obtain the reorientational time correlation functions of tumbling and spinning molecular fluctuations, together with the order parameters <P 2> (infrared) and <P 2>,<P 4 > (Raman). We report results on the temperature dependence of the relevant diffusion coefficients, on the effect of biaxiality on the molecular potential of mean torque, and on the short time behaviour of the autocorrelation function. Such results are discussed in terms of current stochastic models for reorientational dynamics in liquid crystals.
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References
In this Chapter we shall not try to present an exhaustive bibliography; the references we cite however do contain most of the relevant literature on the subject. General reviews on fundamentals can be found in: Kubo, R. (1966) Rep. Progr. Physics, 29, 255; Forster, D. (1975) Hydrodynamics, Fluctuations, Broken Symmetry and Correlation Functions, Benjamin; Berne, B. J. and Pecora, R. (1976) Dynamic Light Scattering, Wyley, New York; Hansen, P. J. and McDonald, I. R. (1976) Theory of Simple Liquids, Academic Press; Barker, A. and Loudon, R. (1972) Rev. Mod. Phys., 44, 18; Wilson, E. B., Decius, J. C. and Cross, P. C., Molecular Vibrations, McGraw-Hill Publ. Co., New York; Sverdlov, L. M., Kovner, M. A. and Krainov, E. P. (1970) Vibrational Spectra of Polyatomic Molecules, (in Russian), Moskow, Nauka; Steele, D. (1971) Theory of Vibrational Spectroscopy, W. B. Saunders, Philadelphia; Volkenstein, M. V., Gribov, L. A., Eljashevich, M. A. and Stepanov, B. I. (1972) Molecular Vibrations, (in Russian), Moskow, Nauka; Clarke, J. H. R. (1977) Advances in IR and Raman Spectroscopy, R. J. H. Clark and R. E. Hester (eds.), Heyden, London, Vol. 4, p. 109.
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Fontana, M.P. (1994). Raman and IR Fluctuation Spectroscopy of Liquid Crystals. In: Luckhurst, G.R., Veracini, C.A. (eds) The Molecular Dynamics of Liquid Crystals. NATO ASI Series, vol 431. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-1168-3_16
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DOI: https://doi.org/10.1007/978-94-011-1168-3_16
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