Heteronuclear and Homonuclear Radio Frequency Driven Recoupling

Abstract

Abstract. The Radio Frequency Driven Recoupling (RFDR) pulse sequence is used in magic-angle spinning (MAS) NMR to recouple homonuclear dipolar interactions. Here we show simultaneous recoupling of both the heteronuclear and homonuclear dipolar interactions by applying RFDR pulses on two channels. We demonstrate the method, called HETeronuclear RFDR (HET-RFDR) on microcrystalline SH3 samples at 10 kHz and 55.555 kHz MAS. Numerical simulations of both HET-RFDR and standard RFDR sequences allow better understanding of the influence of offsets, paths of magnetization transfers for both HET-RFDR and RFDR experiments as well as the crucial role of XY phase cycling.