Refocused INEPT Adding Spectral Editing

INEPT Refocused INEPT Refocused INEPT Normal  

During a delay, all antiphase relationships evolve toward the in-phase relationship and all in-phase relationships evolve toward the antiphase relationship. For example, for a CH2 group during a delay A we have 

2SXI3 - 2Stl cos(7r7A) + S3, sin (tv7A) //. /-coupling evolution 

So you see that refocusing of 13C is always complicated by the fact that the optimal refocusing time is different for a CH, CH2, or CH3 group. Of course, we can exploit these differences to get spectral editing (making peak phase—up, down, or missing—tells us about 

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