High-resolution 1H NMR in the solid state using symmetry-based pulse sequences

We demonstrate new rotor synchronised pulse sequences for obtaining high-resolution 1H NMR spectra in the presence of fast magic angle spinning (MAS). The new sequences exploit selection rules generated by appropriate synchronisation of the radio-frequency (rf) field modulations and the sample rotation. We show preliminary results demonstrating the feasibility of high-resolution proton NMR spectroscopy in the presence of fast MAS, and also demonstrate the resolution of 1H–13C J-couplings in the solid state.