The deuteron fast Fourier transform (FFT) spectra of the ring deuterated nematogens para-azoxyanisole (PAA-d8) and p-methoxybenzylidene p-n-butylaniline (MBBA-d8) have been studied as a function of temperature. An interpretation of the spectra is presented. It is based on the assumption of nonequivalent deuterons, a twist angle φ between the planes of the benzene rings, and an asymmetry order parameter δ in addition to the usual nematic order parameter S. The temperature dependences of δ and φ have been obtained.
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Dong et al. (1977) studied this question.
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