Polarization-luminescence studies of the structure and molecular dynamics of smectic and nematic mesophases
- 15 Downloads
The liquid crystal 50B7A in the smectic A and nematic phases was studied by the method of polarization luminescence. The order parameters P2 and P4 were determined from the experimental values of the luminescence spectrum both neglecting and taking into account relaxation processes in the liquid crystal. The orientational distribution function of the molecules in the ground and excited states are constructed. The orientational relaxation time (∿10−9 sec for the nematic and smectic A phases) is calculated. The results obtained are compared with calculation of the rotational relaxation time determined from the coefficient of diffusion for the related compound EBBA.
KeywordsRelaxation Time Excited State Molecular Dynamic Liquid Crystal Relaxation Process
Unable to display preview. Download preview PDF.
- 1.S. Jen, N. A. Clark, P. S. Pershan, and E. B. Priestley, Phys. Rev. Lett.,31, 1552 (1973).Google Scholar
- 2.L. M. Blinov, Electro- and Magneto-Optics of Liquid Crystals [in Russian], Nauka, Moscow (1978).Google Scholar
- 3.R. L. Humphries, P. G. James, and G. R. Luckhurst, J. Chem. Soc. Farad. Trans.,68, No. 11, 1031 (1972).Google Scholar
- 4.E. V. Gordeev, V. K. Dolganov, and S. P. Krylova, Fiz. Tverd. Tela,25, 1109 (1983).Google Scholar
- 5.F. D. Cehelnik, R. B. Cundall, J. R. Lockwood, and T. F. Palmer, J. Chem. Soc. Faraday Trans.,70, No. 11, 244 (1974).Google Scholar
- 6.A. J. Laedbetter, R. M. Richardson, and C. N. Colling, J. Phys.,36, 37 (1975).Google Scholar
- 7.E. Kuss, Mol. Cryst. Liq. Cryst.,47, 71 (178).Google Scholar
- 8.I. N. Dizov and I. I. Penchev, J. Lumin.,22, 69 (1980).Google Scholar