Abstract
A comparison of the spin-lattice relaxation efficiency of a terminally deuterated and an undeuterated C17 lithium soap shows that reorienting methyl groups almost completely determine the spin-lattice relaxation below room temperature. The minimum of the spin-lattice relaxation time of the proton spins of the partially deuterated soap is more than 15 times that of the undeuterated soap. Taking into account the presence of 5 % undeuterated soap in the terminally deuterated one, the contribution to the spin-lattice relaxation of paramagnetic impurities and of oscillations round the chain axis can be estimated to be less than 2% of the methyl group relaxation.
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