Abstract
The transfer of deuterium spin order in rotating solids has been studied theoretically and experimentally. In the presence of quadrupolar interactions, 2H polarization transfer is enhanced by magic-angle sample spinning (MAS) through a mechanism analogous to the rotational resonance effect in a pair of coupled homonuclear spins-1/2. The master equation that describes the exchange of spin order between two 2H spins interacting with extraneous spins is presented, and its predictions are compared with experimental results. The comparison shows that polarization transfer under MAS can be used to measure the distance between two 2H spins if their dipolar coupling is large compared with the homogeneous linewidth. It is also demonstrated that the relative orientation between 2H quadrupolar coupling tensors can be obtained from a 2D polarization-transfer experiment under MAS.
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