Determination of orientational correlation functions in ordered fluids: Raman scattering

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Abstract
Fourier band shape analysis is applied to obtain the reorientation time correlation functions in the short time limit from the Raman spectra of some ordered nematic liquid crystals. New equations for the simultaneous determination of the static order parameters 〈P2〉 and 〈P4〉, and the tumbling diffusion coefficient Dr⊥ are proposed. Their applicability and accuracy are demonstrated by Raman scattering measurements on two prototype aligned mesogens, namely 4, n‐pentyl 4’‐methoxytolane (PMT) and 4,n‐octylethoxytolane (OET). The molecular dynamics in the investigated aligned nematics is also discussed.

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