Thesis (M.S.)--University of Michigan, 1970.

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Thesis (Ph. D.)--Chemistry and Biochemistry, Georgia Institute of Technology, 2008. / Dr. Marder Seth R, Committee Chair ; Dr. Kippelen Bernard, Committee Co-Chair ; Dr. Brďas Jean-Luc E, Committee Member ; Dr. Perry Joseph W, Committee Member ; Dr. Srinivasarao Mohan, Committee Member.

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The polarized and unpolarized differential cross-sections and the analyzing power angular distributions of the pp→π⁺ d reaction have been measured to a statistical precision of better than one percent over several incident proton beam energies between 350 and 500 MeV for center-of-mass angles from 20° to 150°. The unpolarized differential cross-sections were measured at 350, 375, 425, and 475 MeV with unpolarized incident beams. The polarized differential cross-sections and analyzing powers were measured at 375, 450, and 498 MeV using polarized incident beams. Angular distributions of the unpolarized and polarized differential cross-sections are expanded into Legendre and Associated Legendre polynomial series respectively, and the ai°° and biⁿ° expansion coefficients fit to the respective measurements. The resulting coefficients are compared with existing data and recent theoretical predictions. The observation of significant non-zero a₆°° coefficent is interpreted as indication of a significant contribution from the ¹G₄ N-N partial wave channel at energies as low as 498 MeV. / Science, Faculty of / Physics and Astronomy, Department of / Graduate

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Thesis (Ph. D.)--School of Electrical and Computer Engineering, Georgia Institute of Technology, 2004. Directed by Gary S. May. / Includes bibliographical references (leaves 109-113).

This thesis presents a detailed study of the composition dependence of the thermal and transient mobility of electrons in binary rare gas mixtures. The time independent electron real mobility in binary inert gas mixtures is calculated versus mole fraction for different electric field strengths. The deviations from the linear variation of the reciprocal of the mobility of the mixture with mole fraction, that is from Blanc's law, is determined and explained in detail. Very large deviations from the linear behavior were calculated for several binary mixtures at specific electric strengths, in particular for He-Xe mixtures. An interesting effect was observed whereby the electron mobility in He-Xe mixtures, for particular compositions and electron field strength could be greater than in pure He or less than in pure Xe. The time dependent electron real mobility and the corresponding relaxation time, in particular for He-Ar and He-Ne mixtures are reported for a wide range of concentrations, field strengths (d.c. electric field), and frequencies (microwave electric field). For a He-Ar mixture, the time dependent electron mobility is strongly influenced by the Ramsauer-Townsend minimum and leads to the occurrence of an overshoot and a negative mobility in the transient mobility. For He-Ne, a mixture without the Ramsauer-Townsend minimum, the transient mobility increases monotonically towards the thermal value. The energy thermal relaxation times 1/Pτ for He-Ne, and Ne-Xe mixtures are calculated so as to find out the validity of the linear relationship between the 1/Pτ of the mixture and mole fraction. A Quadrature Discretization Method of solution of the time dependent Boltzmann-Fokker-Planck equation for electrons in binary inert gas mixture is employed in the study of the time dependent electron real mobility. The solution of the Fokker-Planck equation is based on the expansion of the solution in the eigenfunctions of the Fokker-Planck operator. / Science, Faculty of / Chemistry, Department of / Graduate