Etude de la résonance magnétique nucléaire du xénon 129 hyperpolarisé et applications en RMN des liquides

Denis Marion 1
1 LSDRM - Laboratoire Structure et Dynamique par Résonance Magnétique (LCF)
NIMBE UMR 3685 - Nanosciences et Innovation pour les Matériaux, la Biomédecine et l'Energie (ex SIS2M)
Abstract : In liquid samples where both nuclear polarization and spin density are strong, the magnetization dynamics, which can be analysed by NMR (nuclear magnetic resonance) methods, is deeply influenced by the the internal couplings induced by local dipolar fields. The present thesis describes some of the many consequences associated to the presence in the sample of concentrated xenon hyperpolarized by an optical pumping process. First, we deal with the induced modifications in frequency and line width of the proton and xenon spectra, then we present the results of SPIDER, a coherent polarization transfer experiment designed to enhance the polarization of protons, in order to increase their NMR signal level. A third part is dedicated to the description of the apparition of repeated chaotic maser emissions by un unstable xenon magnetization coupled to the detection coil tuned at the xenon Larmor frequency (here 138 MHz). In the last part, we present a new method allowing a better tuning of any NMR detection probe and resulting in sensible gains in terms of sensitivity and signal shaping. Finally, we conclude with a partial questioning of the classical relaxation theory in the specific field of highly polarized and concentrated spin systems in a liquid phase.
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Submitted on : Friday, July 18, 2008 - 4:21:53 PM
Last modification on : Wednesday, January 23, 2019 - 2:38:31 PM
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  • HAL Id : tel-00300658, version 1


Denis Marion. Etude de la résonance magnétique nucléaire du xénon 129 hyperpolarisé et applications en RMN des liquides. Matière Condensée [cond-mat]. Université de Versailles-Saint Quentin en Yvelines, 2008. Français. ⟨tel-00300658⟩



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