Broadband heteronuclear decoupling in the presence of homonuclear dipolar and quadrupolar interactions

Abstract

A new family of composite decoupling sequences designed for heteronuclear broadband decoupling of spin-1 and spin-1/2 in solids and liquid crystals is introduced. The pulse sequences are windowless and perform net rotations in spin space about magic-angle axes. Computer simulations and experimental results are presented to demonstrate their decoupling performance and to discuss their susceptibility toward pulse imperfections. We describe the evaluation of the new sequences, called COMARO (composite magic-angle rotation), and point out some possibilities for further improvements.