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Theses

Résonance magnétique nucléaire haute-résolution sur les noyaux quadrupolaires dans les solides

Abstract : After a brief review of existing methods in high-resolution NMR of quadrupolar nuclei, the manipulation of multiquantum coherences by radiofrequency pulses is studied. Results are then applied to the determination of optimal conditions for performing the recently introduced multiple-quantum magic-angle experiment (MQMAS). The principles of this new method, the different pulse sequences and the data processing are described in detail. Applications on aluminum hydrates and cement pastes show the improvements of this new technique over the previous ones. In a second part, after an investigation of the Floquet theory, a new formalism has been devised for studying the behavior of a spin submitted to a strong quadrupolar interaction and radiofrequency field in a rotating sample. This formalism is then applied to a quantitative study of the phenomenon of rotational induced adiabatic transfert of coherences (RIACT). The extension of our theoretical approach to two-dimensional experiments provides a powerful tool for quantitative analyses of MQMAS spectra. Agreement between experimental data and simulations demonstrates the reliability of our approach. Preliminary results concerning the application of MQMAS spectroscopy, using our simulation programs, to structural study of amorphous materials are presented. The third and last part presents a theoretical and experimental investigation of dipolar order in a rotating sample. Two theoretical models are described, the first for the slow spinning speed regime where an adiabatic approximation can be made, and the second for the fast spinning speed regime.
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https://tel.archives-ouvertes.fr/tel-00002505
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Submitted on : Tuesday, March 4, 2003 - 4:16:25 PM
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Thibault Charpentier. Résonance magnétique nucléaire haute-résolution sur les noyaux quadrupolaires dans les solides. Matière Condensée [cond-mat]. Université Paris Sud - Paris XI, 1998. Français. ⟨tel-00002505⟩

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