Abstract

Proton—deuterium polarization transfer in magic angle spinning polycrystalline solids is investigated. Conditions are derived under which cross polarization is possible. It is shown that standard Hartmann—Hahn cross polarization works well if the quadrupolar coupling constant ω Q o is not too large. For large ω Q o a modification is presented which makes the polarization transfer more effective. These techniques are applied to a sample of partially deuterated p-dimethoxybenzene that contains rigid aromatic and mobile aliphatic deuterium sites.

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