Raman scattering : measurements of depolarization ratios and order parameters in an oriented nematic mesophase

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Abstract
A recent Raman investigation technique [1,2] has been used to study the evolution, with respect to temperature, of two depolarization ratios and deduce the behaviour of the order parameters < P2 > and < P4 > in the nematic liquid crystal p-heptyl- p'-nitrile-biphenyl without recourse to a non-nematic probe. Results show that while < P2 > values can be accounted for within the frame of existing mean-field theories, < P4 > values are somewhat lower than what could be predicted by these theories

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