Investigation of a new model of dipolar-coupled nuclear spin relaxation and applications of dynamic nuclear polarization

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Title Investigation of a new model of dipolar-coupled nuclear spin relaxation and applications of dynamic nuclear polarization
Publication Type dissertation
School or College College of Science
Department Physics & Astronomy
Author Sorte, Eric G.
Date 2011-08
Description This work presents the results of various investigations using various techniques of hyperpolarizing the nuclei of atoms. Hyperpolarization implies magnetic order in excess of the thermal order obtained naturally as described by Curie's law. The main portion of this work presents the results of a detailed experimental exploration of predictions arising from a new model of transverse nuclear spin relaxation in quantum systems, based on possible manifestations of microscopic chaos in quantum systems. Experiments have been carried out on a number of hyperpolarized xenon samples, each di ering in its relative percentage of xenon isotopes in order to vary the homonuclear and heteronuclear dipole couplings in the spin system. The experiments were performed under a variety of conditions in an attempt to observe the behaviors predicted by the model. Additionally, much more extensive measurements were made on a number of samples of solid CaF2 in both single crystal and powder forms. These samples, although thermally polarized, were observed with superior signal to noise ratios than even the hyperpolarized xenon solids, allowing for more precise measurements for comparison to the theory. This work thus contains the rst experimental evidence for the majority of the model's predictions. Additionally, this work contains the rst precise measurements of the frequency-shift enhancement parameters for 129Xe and krypton in the presence of spin-polarized Rb. The determination of these important numbers will be useful to many groups who utilize spinexchange optical pumping in their labs. This work built on the prior knowledge of a precise number for the frequency-shift enhancement parameter of 3He in Rb vapor. Finally, I detail work using NMR to detect nuclear-spin polarization enhancement in silicon phosphorus by a novel, photo-induced hyperpolarization technique developed by the Boehme research group at the University of Utah. Signiif cant nuclear polarization enhancements were observed by the Boehme group due to electron-photon interactions in semiconductor soilds; these enhancements were observed by their e ffects on the ambient electrons and measured with electron spin resonance techniques. The work described here details experiments to observe the enhanced nuclear polarization by directly measuring the intensity increase in an NMR measurement.
Type Text
Publisher University of Utah
Subject Calcium fluoride; Chaos; Dipolar; NMR; Spin; Xenon; Hyperpolarization
Dissertation Institution University of Utah
Dissertation Name Doctor of Philosophy
Language eng
Rights Management Copyright © Eric G. Sorte 2011
Format application/pdf
Format Medium application/pdf
Format Extent 17,010,184 bytes
Identifier us-etd3,46118
Source Original housed in Marriott Library Special Collections, QC3.5 2011 .S67
ARK ark:/87278/s6rf68r8
Setname ir_etd
ID 194450
Reference URL https://collections.lib.utah.edu/ark:/87278/s6rf68r8
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