Polarized FT-IR Study on SmC_(#beta#)* and SmC* of Antiferroelectric Liquid Crystals

摘要

Alignment of molecules and hindered rotation of molecular segments in SmC_(beta)* and SmC* of antiferroelectric and ferroelectric liquid crystals were studied by the polarized infrared absorption spectroscopy. The experimental results show that the apparent molecular tilt angle in SmC_(#beta#) * increases not monotonously but as a two-step staircase with increasing de bias field, and the characteristics of hindered rotation of carbonyl groups in unwound state of helix are the same as that of SmC*.