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A complete description of the investigation and the experimental data used are included as is a description of the theoretical models used for interpretation of the results.","abstract_has_math":false,"creators":["Ford, John Marshall"],"institution":"Virginia Polytechnic Institute and State University","degree_name":"Ph. D.","degree_level":"doctoral","degree_discipline":"Physics","degree_department":"Physics","school":null,"contributors":[],"advisors":[],"committee_chairs":["Roper, L. 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