R. Farhi et Ht. Nguyen, AN EXPERIMENTAL-EVIDENCE FOR LARGE TILT FLUCTUATIONS IN THE S-C-ALPHA-ASTERISK PHASE OF CHIRAL LIQUID-CRYSTALS, Europhysics letters, 40(1), 1997, pp. 49-54
Strong anomalies in the Raman scattered intensity of an internal mode
have been detected in the S-C alpha, phase of C8 tolane. Based upon a
n orientational order parameter analysis, they are attributed to large
tilt angle fluctuations by comparison with those encountered in the n
eighbouring smectic A and smectic C phases.