A homeotropically aligned sample of CS4001 is examined conoscopically both in the ground state and under the application of an electric field parallel to the smectic layers. The results compare well with those predicted by a combination of an extended Jones optical method and a theoretical model of the helix distortions. The comparison not only gives support to the underlying theory, but allows the determination of values for the elastic constant associated with distortions to the helical structure, and also a combination of the interlayer coupling coeffients.
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Parry‐Jones et al. (2002) studied this question.
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