Journal
JOURNAL OF MOLECULAR STRUCTURE
Volume 708, Issue 1-3, Pages 145-163Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.molstruc.2004.04.030
Keywords
liquid crystals; Raman spectroscopy; order parameters
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Traditional approaches to the use of Raman spectroscopy as an aid to the determination of local order parameters in liquid crystalline materials have employed polarizations of the excitation source and/or the analyser which are orthogonal to the liquid crystalline director. The present paper describes a Raman study, which seeks to take advantage of the additional information available from examining the complete range of orientations of the director in relation to these polarization directions. A theory is developed which shows how it is possible to use this additional information to derive more reliable values of the P-2 and P-4 local order parameters in homogeneous and twisted nematic liquid crystal cells. (C) 2004 Elsevier B.V. All rights reserved.
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