Improved J-compensated sequences based on short composite pulses

Efficient J-compensated sequences that are shorter in duration and use less RF pulses have been created from short but very efficient composite 90° RF pulses. The improved J-compensation transforms in-phase into antiphase magnetization and can be incorporated in any pulse sequence that involves evolution of heteronuclear J-couplings. The compensated sequences were tested and incorporated into an HMBC sequence. J-compensated experiments referred to as HMBC-J45 + 90A and HMBC-J45 + 90B, were found to be effective over a wide range of J values.