Gated high power decoupling

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

Fig. 7. Gated high power decoupling (DP) and cross-polarization (CP) spectra of 1 N enriched hexamethylmethoxylated melamine-formaldehyde resin (HMMM). HMMM-1, HMMM-2 and HMMM-3 are resins cured for 1, 3 and 24 h respectively. DP spectra were recorded at 343 K CP spectra were recorded at 298 K with a contact time of 2 ms (adapted from [53])...

Figure 1. Multiple pulse sequences showing normal FT pulse and gated high power decoupling pulse to observe the very mobile components.

Figure 10. Spectral enhancement of rigid network. Spectra (A) obtained from the gated high power decoupling pulse sequence with a delay between repetitive pulses of 2 sec. Spectrum (B) obtained with same pulse sequence except the delay between pulsing Increased to 20 sec.

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. 

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