Space modulation of self-diffusion in the cholesteric phase distorted by a magnetic field

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Abstract
A space modulation of the self-diffusion coefficient along the pitch axis in a cholesteric phase that has been distorted under the action of an applied external magnetic field is suggested by NMR measurements. A phenomenological equation describing the spatial modulation is derived and applied with good agreement to the measured deuterium NMR spectral patterns. The fittings indicate that the amplitude of the modulation is small, but nonetheless an important factor in fitting the data. Finally, some of the implications of a space-modulated diffusion coefficient are discussed.