Abstract: In this paper, a new composite pulse 90°(X)150°(Y)70°(-Y)150°(Y)90° (X) is proposed for broadband heteronuclear decoupling based on theory analysis. Theory and experiments show that the decoupling sequences. NEW-16 and NEW -32, which are incorporated by the new composite pulse, have about 30% wider decoupling bandwidth than the sequences:MLEV-16 and WALTZ-16,which are usually used for broadband decoupling. A circuit is suggested for a practical implementation of most composite pulse decoupling sequences with the Varian XL -200 NMR spectrometer.

Key words: broadband decoupling, decoupling sequence, decoupling bandwidth, composite pulse, resonance offset effect, supercycle