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We report what we believe is the first experimental measurement of biaxiality in a cholesteric phase. This observation is made in a selectively deuterated nematic that was twisted by the addition of a chiral compound. A theoretically predicted biaxial order parameter (measured in terms of an asymmetry in the time-averaged deuterium quadrupole interaction) was found to be {~}10^-3 for a pitch {~}3 {μ}m and to increase both with decreasing pitch and as the isotropic phase is approached.
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Yaniv et al. (1981) studied this question.
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