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Type of Document	Dissertation
Author	Thompson, Don Dean
URN	etd-07052006-130411
Persistent URL	http://resolver.caltech.edu/CaltechETD:etd-07052006-130411
Title	I. Molecular transfer of non-equilibrium nuclear spin magnetization. II. Electron resonance of an organic free radical in zero field
Degree	PhD
Option	Chemistry
Advisory Committee	Advisor Name Title Harden M. McConnell Committee Chair
Keywords	none
Date of Defense	1960-01-01
Availability	unrestricted
Abstract Part I contains a new magnetic resonance technique that has been developed to measure rates of fast molecular processes. The method involves the experimental introduction of a nonequilibrium nuclear magnetization in one system, A, and the subsequent measurement of the rate at which rapid molecular processes transfer this nonequilibrium magnetization to a second system, B. Systems A and B may correspond to different chemical sites in a molecule that give rise to a chemical shift, or to sites that are distinct because of electron coupled spin-spin interaction. This technique has been applied to determinations of the rate of proton exchange between ammonium ions in aqueous solution. Part II contains a description of a theoretical and experimental investigation of zero field electron spin resonance of malonic acid radicals produced by X-irradiation at room temperature. The radicals produced in a single crystal are oriented in a specific manner. The theory involved predicts six lines of equal intensity, except for a very small Boltzmann factor. Some of these transitions have been found experimentally in a small modulation field at 77°K. The electron is presumed to "precess" in the field of the proton; however, the energy levels cannot be explained classically. A detailed account of the experimental apparatus is given.
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