Gated decoupling power

Figure 4,9. Possible schemes for applying proton decoupling when observing a heteronucleus, (a) Gated decoupling (coupled spectrum with NOE), (b) inverse-gated decoupling (decoupled spectrum without NOE) and (c) power-gated decoupling where the rf is applied at two different powers (decoupled spectrum with NOE).

High resolution solution state NMR spectra were obtained using a 10 mm broadband probe on a Bruker WM 500 spectrometer with a 45° flip angle, power-gated broadband decoupling and a relaxation delay of 6 seconds. 

The DD experiment can be applied either continuously or gated [15]. In the latter experiment, often termed inverse-gated decoupling, broad-band irradiation is applied only during acquisition. In this manner, the total power consumption is smaller, and this condition leads to less heating of the sample. 

Fig. 29. Gated high power decoupling (GHPD) pulse sequence...

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