Proton-detected PISEMA

Fig. 17. A proton-detected one-dimensional PISEMA pulse sequence to measure...

Fig. 18. Proton-detected ID PISEMA spectra of a powder sample of A-acetyl- A-D,L-valine obtained using the pulse sequence shown in Fig. 17 under static condition. The experiments were performed with a H Lee-Goldburg spin-lock RF power of...

As discussed later, the application of the SEMA sequence is not limited to the 2D PISEMA experiment, but it can be used to design a variety of sophisticated pulse sequences. For example, the selective transfer of magnetization between strongly coupled heteronuclei by SEMA is the key feature of the sequence that can be utilized in experiments such as HETCOR, H-detected experiments," and experiments to selectively measure relaxation parameters of a proton bonded to S nuclei. 

PISEMA experiments yield the local dipolar field experienced by the or nucleus. Perhaps counter intuitively, it has been shown that better resolution is obtained by using experiments which detect the local dipolar field on protons [129,... 

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