Abstract
This paper deals with spin-lattice relaxation due to classical jumps and incoherent tunnelling of protons and deuterons in hydrogen bonds in solids. An analysis of experimental spin-lattice relaxation data for carboxylic acids suggests that tunnelling does not contribute to spin-lattice relaxation above the temperature at which the thermal energy of molecules and the potential barrier height are equal. It is also shown that contributions to the spin-lattice relaxation rate due to classical motion and incoherent tunnelling in excited vibrational states are negligible for fast proton transfer. However, for deuterons this contribution to spin-lattice relaxation is significant.
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