Pitch measurements on chiral smectic liquid crystals in the C, C_a and C_γ* phases

F. Gouda Physics Department, Chalmers University of Technology, S - 412 96, Göteborg, Sweden

A. Dahlgren Physics Department, Chalmers University of Technology, S - 412 96, Göteborg, Sweden

S. T. Lagerwall Physics Department, Chalmers University of Technology, S - 412 96, Göteborg, Sweden

B. Stebler Physics Department, Chalmers University of Technology, S - 412 96, Göteborg, Sweden

J. Bömelburg Iwan-N.-Stranski-Institut, Technische Universität Berlin, Sekr. ER 11, Str. des 17. Juni 135, D-10623, Berlin, Germany

G. Heppke Iwan-N.-Stranski-Institut, Technische Universität Berlin, Sekr. ER 11, Str. des 17. Juni 135, D-10623, Berlin, Germany

Abstract

The pitch and handedness of the helix have been measured in three substances possessing the helical C*, Cy* and Ca* phases. A comparison between measurements on free-standing films and conventional samples between glass plates is made, showing a smearing-out influence from the glass surfaces in the second case. Hence the freestanding film gives a closer approximation to the intrinsic bulk property.

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Pitch measurements on chiral smectic liquid crystals in the C, C_a and C_γ* phases

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Pitch measurements on chiral smectic liquid crystals in the C*, Ca* and Cγ* phases

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Pitch measurements on chiral smectic liquid crystals in the C, C_a and C_γ* phases