IR absorption spectra of nematic liquid crystals oriented by an external a.c. electric field

Abstract

The influence of a.c. electric field (5kHz) on the IR and FIR spectra of the nematic phase of some liquid crystals with strong positive dielectric anisotropy ( ε_a≈ 10 – 20) and weak negative dielectric anisotropy(ε_a≈ −0,2 – 0,7) was investigated. The changes in the half-widths and integral intensity are explained by means of the changes in the molecular orientation due to the electric field influence.