Low-frequency spectrum of homeotropically aligned liquid crystals: Optical heterodyne-detected Raman-induced Kerr effect spectroscopy of 4-octyl-4′-cyanobiphenyl

Byung Ryool Hyun, Edward L. Quitevis

Research output: Contribution to journalArticle

26 Scopus citations

Abstract

The low-frequency spectrum of homeotropically aligned 4-octyl-4′-cyanobiphenyl in the smectic-A (Sm-A) phase was obtained by using optical heterodyne-detected Raman-induced Kerr effect spectroscopy. The absence of a narrow band at 9 cm-1, corresponding to a pseudo-lattice vibration propagating in a direction perpendicular to the smectic layers, suggests that the spectrum of homeotropically aligned Sm-A is due to orientational modes associated with rotation about the long axis of the molecule and translational modes associated with motion in the smectic layers. The spectrum is described by a bimodal lineshape function in which the lower and higher frequency components are attributed respectively to the translational and orientational modes.

Original languageEnglish
Pages (from-to)725-732
Number of pages8
JournalChemical Physics Letters
Volume370
Issue number5-6
DOIs
StatePublished - Mar 21 2003

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