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Abstract
The frequency dispersion of the proton spin-lattice relaxation rates T−1 1 in the ferroelectric smectic phases of DOBAMBC has been determined in the MHz region and analyzed in terms of the order fluctuations, self-diffusion, and rotational contributions to T−1 1. In the smectic C* phase the main rate determining contribution are order fluctuations with a T−1 1 ∝ ν−1/2 L frequency dependence, whereas in the smectic H* phase the translational diffusion, which is slower than in the smectic H* phase, determines the dispersion of T−1 1.