New coherent averaging effect in magnetic resonance: Modulation-Induced reduction of dipolar coupling

Modulation was used in a transient nutation experiment to remove dipolar splitting. We calculate this new effect and demonstrate it for an isolated two-spin system. The relatively simple technique works efficiently for line narrowing in polycrystalline solids and preliminary results indicate that it should be useful for uncovering chemical-shift and heternuclear-coupling information obscured by homonuclear broadening. © 1976 The American Physical Society.