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

We demonstrate new rotor synchronised pulse sequences for obtaining high-re solution H-1 NMR spectra in the presence of fast magic angle spinning (MAS) . The new sequences exploit selection rules generated by appropriate synchr onisation of the radio-frequency (rf) field modulations and the sample rota tion. We show preliminary results demonstrating the feasibility of high-res olution proton NMR spectroscopy in the presence of fast MAS, and also demon strate the resolution of H-1-C-13 J-couplings in the solid state. (C) 2001 Elsevier Science B.V. All rights reserved.