Non‐linear Raman spectroscopy of liquid crystals: Polarization measurements and relaxation processes in 4‐cyano‐4′‐heptylbiphenyl (7CB)

A. N. Davies, W. Jeremy Jones, Alun H. Price

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16 Citations (Scopus)

Abstract

The non‐linear Raman spectrum of 4‐cyano‐4′‐heptylbiphenyl is reported. Measurements of depolarization ratios of the vibrational bands at 2224 cm−1 (CN stretching), 1606 cm−1 (aromatic ring stretching) and 1185 cm−1 (CH aromatic in‐plane deformation) are used to evaluate the order parameters (〈P2〉 and 〈P4〉) using a ‘line model’ for the molecules. The results are internally consistent and also show the same general features (including some discrepancies in 〈P4〉) reported by other workers. Nevertheless, the results demonstrate that the technique is capable of wide application to the study of the anisotropic properties of liquid crystals and provides a valuable probe into the study of the biaxial nature of these sytems.

Original languageEnglish
Pages (from-to)521-529
Number of pages9
JournalJournal of Raman Spectroscopy
Volume25
Issue number7-8
DOIs
Publication statusPublished - 1 Jan 1994
Externally publishedYes

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