J. Phys. II France
Volume 7, Numéro 1, January 1997
Page(s) 57 - 67
DOI: 10.1051/jp2:1997114
J. Phys. II France 7 (1997) 57-67

IR-Modulation Spectroscopy on the Collective Dynamics of Free-Standing Ferroelectric Liquid Crystalline Films

Norbert Klöpper, Friedrich Kremer and Thomas M. Fischer

Universität Leipzig, Fakultät für Physik und Geowissenschaften, Linnéstr. 5, 04103 Leipzig, Germany

(Received 20 June 1996, revised 31 July 1996, accepted 7 October 1996)

We present a novel experimental approach for determining the dynamics of free-standing ferroelectric liquid crystalline films in the frequency range from 1 Hz to 10 3 Hz. By measuring the dynamic infrared dichroism of specific absorption bands in a free-standing FLC-film exposed to rotating external electric fields within a miniaturized electrode arrangement the collective dynamics and the innermolecular response of the FLC system can be analysed. In the SmC* phase a dynamic process is found which corresponds to a resonant switching behaviour which can be described by the model of kink switching. The main contribution to the dynamics of the SmC* phase is caused by the molecular moieties in the mesogenic core.

© Les Editions de Physique 1997