Resonant X-ray diffraction study of a new brominated chiral SmCA* liquid crystal

P. Cluzeau, P. Gisse, V. Ravaine, A. M. Levelut, P. Barois, C. C. Huang, F. Rieutord, H. T. Nguyen

Research output: Contribution to journalConference articlepeer-review

14 Scopus citations

Abstract

We present a new high energy resonant x-ray scattering study of a brominated chiral liquid crystal material exhibiting antiferro, ferri and ferroelectric smectic C phases. The absorption K-edge of bromine is at much higher energy (13.49 keV) than the sulfur K-edge (2.47 keV) which should enable a wider variety of experimental geometries. A weak resonant signal is detected on free standing films in the SmCA* phase only. Interestingly, the signal is stronger in binary mixtures with a bromine free thiobenzoate compound. This observation suggests that most chiral liquid crystal structures could be studied by resonant scattering after incorporation of a molecule bearing a resonant atom as a probe. Resonant x-ray diffraction profiles are also calculated for some recently proposed distorted clock models of the 4-layer ferrielectric phases. Finally, the influence of defects is investigated.

Original languageEnglish (US)
Pages (from-to)1-18
Number of pages18
JournalFerroelectrics
Volume244
Issue number1-4
DOIs
StatePublished - 2000
EventSeventh International Conference on Ferroelectric Liquid Crystals - Darmstadt, Ger
Duration: Aug 29 1999Sep 3 1999

Bibliographical note

Funding Information:
Goodby, P. Mach and R. Pindak. The resonant diffraction experiments benefitted from financial support from ESRF, from CNRS (GDR 606 “Cristaux liquides en geometrie confinee“) and from the NSF-INT 9815859 and NSF-DMR 9901739. We are grateful to Professor Haase and the organisers of the FLC99 conference for giving us the opportunity to present this work.

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