Frequency-switched Lee-Goldberg

Recently, the two-dimensional 13C H heteronuclear correlation (HETCOR) NMR method, using the frequency-switched Lee-Goldberg (FSLG) H decoupling sequence55 at high MAS rates, has been developed, in order to provide intermolecular and spatial distance information. The HETCOR spectrum often has multiple proton cross peaks for each carbon, and these cross peaks can be extremely helpful for assigning the spectrum. Thus, this method can be used to characterize the structure of polymers in solids.55 71... 

The experiments which allow to remove the artifact peaks from the z-filtered refocused INADEQUATE MAS NMR pulse sequence have been designed by Baltisberger et al. In these experiments the frequency-switched Lee-Goldberg method of homonuclear decoupling during the z-filter has been applied the method has the advantage of being quite easy to set up and implement on most modern NMR spectrometers. 

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