Hartmann-Hahn polarization transfer in liquids: An ideal tool for selective experiments
✍ Scribed by Pelupessy, Philippe ;Chiarparin, Elisabetta
- Publisher
- John Wiley and Sons
- Year
- 2000
- Tongue
- English
- Weight
- 699 KB
- Volume
- 12
- Category
- Article
- ISSN
- 1043-7347
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✦ Synopsis
ÁBSTRACT: Cross-polarization using continuous-wave spin-locking fields has never become routine in liquid-state nuclear magnetic resonance. Efficiency of cross-polarization ( ) tends to be strongly attenuated if radio-frequency RF fields are not perfectly homogeneous. It has recently been demonstrated that imperfections in RF-fields have little effect on efficiency of polarization transfer, provided that RF-amplitudes are comparable to magnitudes of heteronuclear scalar coupling constants, rendering this method ideal for selective experiments. The technique can be exploited for the excitation of nuclei with a low gyromagnetic factor like 13 C and 15 N, as well as of nuclei with a high gyromagnetic factor like 1 H. Several useful applications are discussed.