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. Author manuscript; available in PMC: 2013 Jun 26.
Published in final edited form as: NMR Biomed. 2011 Aug 23;24(8):958–972. doi: 10.1002/nbm.1761

Figure 12.

Figure 12

Time and frequency domain features of broadband decoupling. (A) In most realistic cases the length of the decoupling RF pulses span several dwell times Δ τ, such that the effects of heteronuclear scalar coupling evolution are not refocused until the end of the pulse. As a result part of the scalar coupling evolution is captured by the data acquisition points covering the length of the RF pulse. (B) These small modulations give rise to so-called decoupling or modulation side bands following Fourier transformation, potentially obscuring other, smaller resonances. The decoupling sidebands necessarily also lead to a reduction in the peak height of the main decoupled resonance (100% represents the maximum intensity in the case of perfect on-resonance CW decoupling).