{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/101481"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/101481","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Characterization and analysis of ball plasmoid discharges","abstract":"Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2018-09-27 without embargo terms","abstract_html":"Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2018-09-27 without embargo terms","abstract_has_math":false,"creators":["Dubowsky, Scott Edwin"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Chemistry","degree_department":null,"school":null,"contributors":["McCall, Benjamin J.","Eden, James G.","Dlott, Dana D.","Ruzic, David N."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2018,"date_issued":"2018-09-27T16:17:23Z","date_published":"2018-09-27T16:17:23Z","updated_at":"2026-07-22T22:24:40Z","subjects":["Ball plasmoids, ball lightning, mass spectrometry, emission spectroscopy, plasma"],"languages":["en"],"rights":["Copyright 2018 by Scott Edwin Dubowsky. All rights reserved."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"http://hdl.handle.net/2142/101481","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["McCall, Benjamin J.","Eden, James G.","Dlott, Dana D.","Ruzic, David N."]},{"key":"dc:creator","label":"Author","values":["Dubowsky, Scott Edwin"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2018-09-27T16:17:23Z","2018-06-04","2018-08"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Chemistry"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Ball plasmoids, ball lightning, mass spectrometry, emission spectroscopy, plasma"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright 2018 by Scott Edwin Dubowsky. All rights reserved."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/101481"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2018-09-27 without embargo terms","The student, Scott Dubowsky, accepted the attached license on 2018-06-02 at 14:45.","The student, Scott Dubowsky, submitted this Dissertation for approval on 2018-06-02 at 14:54.","This Dissertation was approved for publication on 2018-06-04 at 14:19.","DSpace SAF Submission Ingestion Package generated from Vireo submission #12608 on 2018-09-27 at 10:44:34","Ball plasmoid discharges are uniquely long-lived plasmas that are generated by a pulse of several kiloJoules of stored energy over the surface of a grounded volume of water. The plasmoid has a visible lifetime on the order of a few hundred milliseconds, part of which appears to persist without power input. Predictions of the recombination time of ball plasmoids using air plasma models dictate that the system should dissipate within a millisecond-- this discrepancy indicates that there is likely some unexplained mechanism (physical, chemical, or otherwise) by which ball plasmoids are stabilized. The search for this potential mechanism has motivated the work described in this thesis for the past several years. Ball plasmoid discharges are considered to be laboratory analogues of ball lightning, a naturally-occurring and still unexplained phenomenon. To date, ball lightning has not been reproduced in the laboratory, therefore studies aimed at explaining the formation and lifetime of ball lightning must rely on laboratory analogues. Like ball plasmoids, the reported lifetime of ball lightning (seconds) is several orders of magnitude longer than what would be expected at atmospheric pressure. An understanding of the mechanism(s) responsible for the long lifetime of ball plasmoids could perhaps provide insight into the stability of ball lightning. To gain a comprehensive understanding of the chemistry that occurs during a ball plasmoid discharge, several techniques were implemented to analyze various physico-chemical properties of the plasmoid. Experiments using mass spectrometry, emission spectroscopy, microwave interferometry, and electrical analyses in ambient air and other gases are described throughout this thesis. The combination of these results furthers our understanding of the composition of these plasmoids. We have identified the major ions present in the plasmoid and have shown through statistical analysis of water clusters that the electrolyte contributes to the formation more than the ambient environment. Emission spectroscopy reveals emission from a wide variety of molecular and atomic species, including OH and NH radicals, H-α, H-ß, O I, N I, W I, Cu I, Fe I, Cu II, and Fe II, and facilitates a deeper discussion of molecular excitation and dissociation processes than has been presented to date in the literature. Finally, preliminary measurements of plasmoid discharges in argon indicate that the resistance of the plasmoid is significantly different in a rare-gas atmosphere compared to ambient air. While this work does not answer all of the questions surrounding the stability of ball plasmoids, unexplored avenues of experimentation and analysis were investigated at higher energies than previously reported. Results inferred from these experiments provide a foundation from which further studies of this system can be undertaken.","Made available in DSpace on 2018-09-27T16:17:23Z (GMT). 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Predictions of the recombination time of ball plasmoids using air plasma models dictate that the system should dissipate within a millisecond-- this discrepancy indicates that there is likely some unexplained mechanism (physical, chemical, or otherwise) by which ball plasmoids are stabilized. The search for this potential mechanism has motivated the work described in this thesis for the past several years. Ball plasmoid discharges are considered to be laboratory analogues of ball lightning, a naturally-occurring and still unexplained phenomenon. To date, ball lightning has not been reproduced in the laboratory, therefore studies aimed at explaining the formation and lifetime of ball lightning must rely on laboratory analogues. Like ball plasmoids, the reported lifetime of ball lightning (seconds) is several orders of magnitude longer than what would be expected at atmospheric pressure. An understanding of the mechanism(s) responsible for the long lifetime of ball plasmoids could perhaps provide insight into the stability of ball lightning. To gain a comprehensive understanding of the chemistry that occurs during a ball plasmoid discharge, several techniques were implemented to analyze various physico-chemical properties of the plasmoid. Experiments using mass spectrometry, emission spectroscopy, microwave interferometry, and electrical analyses in ambient air and other gases are described throughout this thesis. The combination of these results furthers our understanding of the composition of these plasmoids. We have identified the major ions present in the plasmoid and have shown through statistical analysis of water clusters that the electrolyte contributes to the formation more than the ambient environment. Emission spectroscopy reveals emission from a wide variety of molecular and atomic species, including OH and NH radicals, H-α, H-ß, O I, N I, W I, Cu I, Fe I, Cu II, and Fe II, and facilitates a deeper discussion of molecular excitation and dissociation processes than has been presented to date in the literature. Finally, preliminary measurements of plasmoid discharges in argon indicate that the resistance of the plasmoid is significantly different in a rare-gas atmosphere compared to ambient air. While this work does not answer all of the questions surrounding the stability of ball plasmoids, unexplored avenues of experimentation and analysis were investigated at higher energies than previously reported. Results inferred from these experiments provide a foundation from which further studies of this system can be undertaken.","Made available in DSpace on 2018-09-27T16:17:23Z (GMT). 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