Water flip-back

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In water flip-back element a hard readout 90o pulse on 1H is preceded by a selective 90o pulse on water resonance with phase opposite to that of the hard pulse.

If 1H magnetization was along z axis before the selective pulse, water resonance will stay along z and won't be observed.


  1. Grzesiek, S and Bax, A. The importance of not saturating water in protein NMR. Application to sensitivity enhancement and NOE measurements. Journal of the American Chemical Society 115(26):12593--12594, 1993. BibTeX [wfb]
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