Abstract
It is shown that the heteronuclear cross-polarization efficiency in the rotating frame can be improved by sweeping the radio-frequency amplitude adiabatically through the Hartmann—Hahn condition. The enhancement is particularly significant for strongly coupled IS spin systems with weak dipolar coupling to extraneous spins. A good approximation to an adiabatic transfer is obtained with a tangential time dependence of the radiofrequency field amplitude whereby transient oscillations are efficiently suppressed.
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