Az inverz Raman-spektroszkópia alkalmazása folyadékkristályok szerkezetvizsgálatában

Translated title of the contribution: Applications of inverse Raman spectroscopy for the study of the structures of liquid crystals

A. Grofcsik, M. Kubinyi, Jan Baran, William Jeremy Jones

Research output: Contribution to journalArticle

Abstract

An inverse Raman spectrometer consisting of two synchronously pumped dye lasers has been employed to study molecular orientations within liquid crystal cells and the change of these orientations under the influence of external electric fields. The inverse Raman spectrum of nematic 4-cyano-4′-pentylbiphenyl (5CB) has been recorded and the most intense (1606 cm-1) band was selected for monitoring the changes of the orientation of the molecules. When an external field was applied, switching times of ∼10 ms were measured, while the time constant of the reorientation of molecules after removing the field was found to be ∼75 ms. A similar method was employed to study the dynamical behaviour of the ferroelectric liquid crystal LPM9, which consists of a mixture of monofluorophenyl biphenylcarboxylate esters and a chiral dopant. Depending on the amplitude and the polarity of the applied square wave field, the measured reorientational time constants were found to fall between 0.45 and 2.3 ms.

Original languageHungarian
Pages (from-to)437-442
Number of pages6
JournalMagyar Kemiai Folyoirat, Kemiai Kozlemenyek
Volume103
Issue number9
Publication statusPublished - Sep 1997

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Liquid Crystals
Raman spectroscopy
Molecules
Dye lasers
Molecular orientation
Ferroelectric materials
Spectrometers
Raman scattering
Esters
Electric fields
Doping (additives)
Monitoring
4-cyano-4'-pentylbiphenyl

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Az inverz Raman-spektroszkópia alkalmazása folyadékkristályok szerkezetvizsgálatában. / Grofcsik, A.; Kubinyi, M.; Baran, Jan; Jones, William Jeremy.

In: Magyar Kemiai Folyoirat, Kemiai Kozlemenyek, Vol. 103, No. 9, 09.1997, p. 437-442.

Research output: Contribution to journalArticle

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