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An alternative spin‐state‐selective pulse sequence element

A simple modification of the spin‐state‐selective excitation (S3E) pulse sequence element is proposed. The new sub‐sequence, dubbed S2ED for spin‐state echo differentiation, can be used in a very versatile way, in addition to the standard features of S3E. Experimental verifications were performed by editing α/β–HSQC–α/β spectra of nitrogen‐15‐labelled ubiquitin. Copyright © 2003 John Wiley & Sons, Ltd.