A HIGH-ORDER AND BROAD-BAND CRAMPS EXPERIMENT USING Z-ROTATIONAL DECOUPLING

A novel solid-state NMR method for the combined rotation and multiple- pulse spectroscopy (CRAMPS) of homonuclear dipolar-coupled nuclei is i ntroduced. Using a magic-sandwich sequence with z-rotational decouplin g, high-order truncation of the dipolar interaction is combined with i mproved performance under resonance offsets and spinning speeds higher than those typically used in conventional CRAMPS. The method is descr ibed using average Hamiltonian theory to third order and demonstrated experimentally by H-1 CRAMPS of rigid organic solids. (C) 1997 Elsevie r Science B.V.