Abstract
The polarized electronic absorption spectra, orientation ordering, and the special local field features were studied for push-pull linear dye molecules with strong donor-acceptor electronic conjugation of terminal fragments in the matrix of a nematic liquid crystal. The temperature-induced inversion of the sign of the splitting of polarized impurity absorption bands was observed. This effect was shown to be caused by the statistical character of orientation ordering of impurity molecules and manifestation of the higher moments of the orientation distribution function. The dependence of local field parameters (Lorentz tensor components) of impurity molecules on their orientation ordering was established. This dependence was used to reproduce the temperature dependence of the orientation order parameter of the matrix.
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Translated from Zhurnal Éksperimental’no\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) i Teoretichesko\(\overset{\lower0.5em\hbox{$\smash{\scriptscriptstyle\smile}$}}{l}\) Fiziki, Vol. 125, No. 6, 2004, pp. 1311–1316.
Original Russian Text Copyright © 2004 by Aver’yanov, Rumyantsev.
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Aver’yanov, E.M., Rumyantsev, V.G. Manifestations of the higher moments of the orientation distribution function of molecules in the spectral properties of an impurity nematic. J. Exp. Theor. Phys. 98, 1146–1151 (2004). https://doi.org/10.1134/1.1777627
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DOI: https://doi.org/10.1134/1.1777627