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Abstract
The spin lattice relaxation times have been measured for all the deuterium nuclei in bromobenzene-d5 dissolved in thermotropic nematic mixtures of EBBA and ZLI 1167. A Jeener-Broekaert pulse sequence was used. The spectral density functions evaluated for different compositions of the nematic mixture were related to the present theories of anisotropic tumbling molecules in anisotropic phases.