Investigations of orientational order for an antiferroelectric liquid crystal by polarized Raman scattering measurements - art. no. 021706

Citation
N. Hayashi et T. Kato, Investigations of orientational order for an antiferroelectric liquid crystal by polarized Raman scattering measurements - art. no. 021706, PHYS REV E, 6302(2), 2001, pp. 1706
Citations number
45
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW E
ISSN journal
1063-651X → ACNP
Volume
6302
Issue
2
Year of publication
2001
Part
1
Database
ISI
SICI code
1063-651X(200102)6302:2<1706:IOOOFA>2.0.ZU;2-5
Abstract
The orientational ordering of the antiferroelectric liquid crystal molecule s, 4-(1-methyl-heptyloxycarbonyl)phenyl 4'-octyloxybiphenyl-4-carboxylate w as investigated in the series of the successive smectic phases by means of polarized Raman scattering measurement without any external held. An improv ed equation for the analysis of the polarized Raman intensity was derived a s a function of an incident laser polarization and the orientational order parameters. Even in the chiral smectic phases, some apparent orientational order parameters could he defined by the proper corrections for the smectic layer structure and an optical disturbance. An unusual change of the orien tational order parameters was observed with decrease in temperature. It was concluded that the irregular variation of the order parameter stemmed from the biaxiality of the molecular orientational distribution, which was attr ibuted to the hindrance of molecular rotation around its long axis.