Polarized UV spectroscopy of conjugated liquid crystals
作者:
Shin‐Tson Wu,
Elena Ramos,
Ulrich Finkenzeller,
期刊:
Journal of Applied Physics
(AIP Available online 1990)
卷期:
Volume 68,
issue 1
页码: 78-85
ISSN:0021-8979
年代: 1990
DOI:10.1063/1.347073
出版商: AIP
数据来源: AIP
摘要:
Polarized absorption spectra of 13 nematic liquid crystals (LCs) with various conjugations and structures were measured in the spectral range from 185 to 400 nm. These absorption bands represent all the &pgr;→&pgr;* electronic transitions of these LCs. Resonance wavelength, absorption coefficient, and dichroic ratio of each band were characterized. The contribution of each band to LC birefringence is briefly discussed. Some structural effects on the LC absorption are illustrated. These absorption spectra will also serve as valuable data bases for further theoretical calculations on the band structure of LC molecules.
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