Abstract
The action of heteronuclear decoupling applied to I spins while observing the resonance of a second nuclear species S is examined for systems prepared in an arbitrary initial state. It is shown that unexpected effects may be produced: The removal of heteronuclear interactions by strong decoupling fields does not guarantee that the two spin systems behave independently. In particular it is demonstrated that antiphase multiplet magnetization of the S spins remains directly responsive to the radio-frequency I spin perturbation, and to I-I interactions, even when the decoupling removes the heteronuclear coupling interactions completely. Some simple illustrative examples are examined theoretically and experimentally.
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