Spin Decoupling

1. Optimize a standard 1-D proton spectrum.

2. Put cursor on peak to be spin decoupled and type:

•  nl             (nearest line, unless it is an even numbered multiplet; in that case the chemical shift of the signal is the center of the multiplet)
• sd             (set decoupler)
• dm='y'      (decoupler mode on)
• dmm='c'   (decoupler modulation mode continuous)
• homo='y'  (homonuclear decoupler on)
• dpwr=~20  (decoupler power; will most likely need to be adjusted. It can be set anywhere from 1 - 49. Calibration charts are posted on each of the spectrometer workstations.)
• ga             (go acquire)

3. The decoupled (irradiated) peak should have little or no intensity in the decoupled spectrum, except a small spike. If the irradiated peak:

• consists of a large jagged spike, decrease dpwr
• is not completely decoupled, increase dpwr
• is not reduced in intensity or decoupled at all, you probably need to reset sd to the desired peak, and/or check that homo='y'