J-COMPENSATED COMPOSITE PULSE EXCITATION SEQUENCES FOR POLARIZATION TRANSFER IN HETERONUCLEAR SPIN SYSTEMS

New composite pulse sequences for the production of two-spin order tha t are broadband with respect to the internal heteronuclear J coupling interaction are presented. These NMR pulse sequences were developed fr om existing RF-compensated sequences or obtained from numerical optimi zation. Incorporation of these composite sequences into the preparatio n period of the standard INEPT experiment results in excellent polariz ation transfer over a wide range of heteronuclear coupling magnitudes and are more effective than existing broadband experiments. (C) 1995 A cademic Press Inc.