ADIABATIC PASSAGE HARTMANN-HAHN CROSS-POLARIZATION IN NMR UNDER MAGIC-ANGLE SAMPLE-SPINNING

We have recently demonstrated that polarization transfer using an adia batic passage through the Hartmann-Hahn condition (APHH-CP) by a varia tion of the radio-frequency amplitude can substantially improve the tr ansfer efficiency over Hartmann-Hahn cross polarization. Here we show that APHH-CP can be combined with fast magic angle sample spinning (MA S). The heteronuclear dipolar order, established in the course of the transfer, can indeed be created and preserved.