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Type of Document	Dissertation
Author	Thomas, Donal D.
URN	etd-05142003-150740
Persistent URL	http://resolver.caltech.edu/CaltechETD:etd-05142003-150740
Title	The magnetic resonance of triplet excitons in solid free radicals. A zero field magnetic resonance spectrometer
Degree	PhD
Option	Chemistry
Advisory Committee	Advisor Name Title Unknown Committee Member
Keywords	None
Date of Defense	1964-01-01
Availability	unrestricted
Abstract NOTE: Text or symbols not renderable in plain ASCII are indicated by [...]. Abstract is included in .pdf document Part I. The magnetic resonance of triplet excitons in solid free radicals has been studied in both zero magnetic field and a high magnetic field. A discussion of the spin Hamiltonian for triplet excitons in zero field and high field is presented. Calculations of the second moment of the exciton resonances is given and compared for the two cases. The fine-structure splittings of triplet excitons in Wurster's blue perchlorate in a high magnetic field and in ([...][subscript 3] AsCH[subscript 3] + (TCNQ)[subscript 2]- in zero field have been determined and their temperature dependence is discussed. The temperature dependence of the line width is also given. Part II. A zero field magnetic resonance spectrometer has been constructed for use in the 10 - 100 Mc/sec frequency range. A marginal oscillator and bidirectional square wave field modulation are used.
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