Gradient-enhanced INEPT

The operation of the proton-enhanced sequences is best understood by reference to the original INEPT-INADEQUATE sequence shown in simplified form in Fig. 5.80 in which the individual component parts have been identified and may be followed in a stepwise manner. Thus, initial transfer from proton to carbon is via the INEPT sequence introduced in Chapter 4 followed by the generation of DQC as for the INADEQUATE above. This again evolves to encode c after which gradient selection begins. The DQ then returns to single quantum, and the C- C-coupling is refocused by the spin-echo. The final step is INEPT in reverse to transfer from carbon back onto proton, followed by... 

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