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Aspects fondamentaux de la Résonance Quadripolaire Nucléaire de l'azote-14 par impulsion de champ radiofréquence -Vérifications expérimentales

Abstract : Nuclear Quadrupole Resonance (NQR) is a spectroscopic method which is used to detect, in a powder sample, a molecule containing quadrupolar nuclei, there are nuclei with a spin greater than ½ (e.g. 35Cl, 14N). This technique has known recently a renewed interest because of its potentiality for detecting drugs and explosives. During this three-year thesis, we attempted to find appropriated methods for using Nuclear Quadrupole Resonance at the maximum of its capabilities. First, we developed a novel theoretical approach universally applicable to any type of experiment. This approach has proven especially useful for optimizing the parameters involved in several experiments. The latter have been shown to support our theoretical predictions. As there is no NQR spectrometer commercially available, the most stringent prerequisite was to develop a dedicated instrument with a specific software allowing us to design new experiments. We studied two inert compounds: sodium nitrite and hexamethylenetetramine as well as an explosive: RDX. Many applications and verifications have been possible, for instance, the detection and characterization of RDX samples from different batches, or the variation of relaxation times as a function of temperature.
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https://hal.univ-lorraine.fr/tel-01481910
Contributor : Maude Ferrari <>
Submitted on : Friday, March 3, 2017 - 9:04:12 AM
Last modification on : Thursday, February 25, 2021 - 10:00:02 AM
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Maude Ferrari. Aspects fondamentaux de la Résonance Quadripolaire Nucléaire de l'azote-14 par impulsion de champ radiofréquence -Vérifications expérimentales. Chimie théorique et/ou physique. Université de Lorraine, 2008. Français. ⟨tel-01481910⟩

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