Stochastic model for the reorientation of molecules around their long axes in a smectic C phase
作者:
P. Schiller,
期刊:
Liquid Crystals
(Taylor Available online 1994)
卷期:
Volume 17,
issue 5
页码: 667-679
ISSN:0267-8292
年代: 1994
DOI:10.1080/02678299408037338
出版商: Taylor & Francis Group
数据来源: Taylor
摘要:
In smectic phases molecules can reorientate around their long and short axes. The motion of a molecule around its long axis is non-cooperative and influenced by both stochastic and deterministic forces exerted by neighbouring molecules. Solving the Smoluchovsky equation for such a reorientation process, two-time correlation functions are calculated which are related to frequency-dependent susceptibilities. The results are used for investigating how deterministic forces in higher ordered smectic phases have an effect on microwave spectra. It can be concluded that the quadrupolar ordering produces a splitting of the relaxation frequency. This splitting, which should occur at the transition from the smectic A to the smectic C phase, is only weakly influenced by an additional dipolar (ferroelectric) ordering.
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