Direct evidence of a magnetization transfer between laser-polarized xenon and protons of a cage-molecule in water |
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Authors: | H Desvaux T Gautier G Le Goff M Pétro P Berthault |
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Institution: | (1) Service de Chimie Moléculaire, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France, FR;(2) Service de Physique de l'état Condensé, CEA/Saclay, 91191 Gif-sur-Yvette Cedex, France, FR |
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Abstract: | In a dedicated experimental setup, we directly prepare liquid-state NMR samples containing laser-polarized xenon with nuclear
polarization larger than 5% at pressures up to 4 bars. Coating of the NMR tube surface allows us to increase the self-relaxation
time of xenon in the gaseous phase to approximately 4.5 hours. Using a modified SPINOE pulse sequence, we present the first
direct detection of a regioselective proton signal enhancement of a molecule -cyclodextrin) dissolved in water resulting from cross-polarization between laser-polarized xenon and protons.
Received 16 March 2000 and Received in final form 22 May 2000 |
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Keywords: | PACS 76 60 -k Nuclear magnetic resonance and relaxation - 32 80 Bx Level crossing and optical pumping - 87 15 -v Biomolecules: structure and physical properties |
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