Slice-selective polarization transfer (or cross-polarization) for localized solid-state NMR spectroscopy

Abstract

A new principle for spatially localized solid-state NMR is reported. Polarization transfer (or cross-polarization or more generally spin-order transfer) is strongly susceptible to deviations from the resonance conditions. Hartmann—Hahn matching and matching to the local field in dipolar order states while magnetic field gradients are present have been treated theoretically and studied experimentally. The transfer process was found to be slice selective. The spatial resolution exceeds that of the localization effect by spin-locking in the presence of field gradients. Applications to imaging localized heteronuclear spectroscopy are discussed. First test experiments to this end are reported.