C-13-H-1 DIPOLAR RECOUPLING DYNAMICS IN C-13 MULTIPLE-PULSE SOLID-STATE NMR

The recoupling of C-13-H-1 dipolar interactions by applying C-13 pulses under a H-1 decoupling rf field is discussed. It is theoretically and experimentally shown that C-13 spectral line-broadening due to such recoupling in a C-13 pi-pulse train can be minimized by setting the rf field intensity for H-1 decoupling to around three times that for C-13 pi pulses, or stronger.