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The109Ag nuclear magnetic resonance line in a sample of polycrystalline AgF is observed to broaden substantially when the19F spins are irradiated near the magic angle in their rotating frame. This is due to the reduction of19F—19F dipolar coupling, which normally causes fluctuations in the19F—109Ag interactions (Abragam and Winter), inducing an exchange narrowing analogous to classical motional narrowing. The109Ag linewidths obtained over the entire motional range at different19F frequencies are compared with those calculated exactly from the ratio of second to fourth moment.

NMR line broadening in solids by slowing down of spin fluctuations