J. Phys. II France
Volume 6, Numéro 9, September 1996
Page(s) 1291 - 1300
DOI: 10.1051/jp2:1996131
J. Phys. II France 6 (1996) 1291-1300

Electric Field Effects on the Pretransitional Optical Activity of CB15

Carlos Hunte, Upindranath Singh and Peter Gibbs

Physics Department, University of the West Indies Cave Hill, Barbados, West Indies

(Received 17 January 1996, revised 4 April 1996, accepted 30 May 1996)

The influence of applied electric fields on the pretransitional optical activity ( $\phi$) in the chiral nematic 4-cyano-4-(2-methyl)butylphenyl (CB15) was investigated. A rotating analyzer system was used to measure the optical activity and fields up to 800 kV/m were applied. The zero-field results are consistent with theoretical predictions and contributions from the m=2 mode to $\phi$ are evident in the data. Large electric fields destroyed the contributions from the m=2 mode.

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