High frequency relaxation in nematic liquid crystal mixtures by Brillouin scattering
Tu, C. -S.
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Brillouin scattering as a function of scattering angles from 180° to ∼10° has been measured in the nematic phases of two liquid crystal mixtures, E. Merck ZLI-2861 and E7, without any preferred orientation. Such measurements at room temperature cover the frequency range from ∼10 to ∼1 GHz. The behavior of both the frequency shifts and linewidths is explained by a single time internal relaxation process with the characteristic frequencies 3.2 (ZLI-2861) and 1.2 (E7) GHz respectively. The behavior of the hypersonic attenuation shows no correlation with the static bulk viscosity in the nematic phase.
I.G. Siny, C.-S. Tu, and V.H. Schmidt, “High frequency relaxation in nematic liquid crystal mixtures by Brillouin scattering,” Molecular Crystals and Liquid Crystals Science and Technology. Section A. Molecular Crystals and Liquid Crystals 269, 125-132 (1995).