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Heteronuclear double cross-polarization (1H−X; X−1H) transfer in liquids

✍ Scribed by D. Canet; P. Tekely; K. Elbayed; F. Humbert

Publisher
Elsevier Science
Year
1990
Tongue
English
Weight
478 KB
Volume
175
Category
Article
ISSN
0009-2614

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✦ Synopsis

Hartmann-Hahn

cross-polarization transfers in liquids are used for correlating two J-coupled nuclei of different isotopic nature. It is explainedwhy continuous-wave spin-locking fields are difficult to use and have to be replaced by phase-modulated fields which compensate for inhomogeneity effects. Cross-polarization procedures are applied twice: firstly for transferrmg proton polarization to an X nucleus; secondly, after saturation of all non-involved proton transitions, from X to proton. The subsequent protonacquisition ensures optimal sensitivity. The proposed method, in contrast with the widely used HMQC sequence, provides in-phase responses.

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