Distorsionless enhancement by polarization transfer

B This pulse sequence, the ID DEFT (Distorsionless Enhancement by Polarization Transfer) experiment, was developed to measure carbon chemical shifts with enhanced sensitivity and to determine at the same time their multiplicities, to differentiate between CH, CH, CH and C. It is a heteronuclear multiple pulse experiment with pulses applied to perturb both carbon and proton spins. Il consists of a preparation, a mixing (used to transfer proton polarization to the directly bound carbons) and a detection period. 

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