The reaction rate coefficients between the hydronium ion and the molecules ethene (C2H4), propene (C3H6), 1-butene (C4H8) and hydrogen sulfide (H2S) were measured at 296 K. The measured reaction rates were compared to collision rates calculated using average dipole orientation (ADO) theory. Reaction efficiency depends primarily upon the proton affinity of the molecules. All the measurements were obtained using the newly developed microwave cavity discharge flowing afterglow (MCD-FA) apparatus. This device uses an Asmussen-type microwave cavity discharge ion source that is spatially separated from the flow tube, eliminating many of the problems inherent with the original FA devices. In addition to measuring reaction rate coefficients, the MCD-FA was shown to be an effective tool for measuring trace compounds in atmospheric air. This method has many advantages over current detection techniques since compounds can be detected in almost real time, large mass ranges can be scanned quickly, and repeated calibration is not required. Preliminary measurements were made of car exhaust and exhaled alveolar air. Car exhaust showed the presence of numerous hydrocarbons, such as butene, benzene and toluene while the exhaled alveolar air showed the presence of various volatile organic compounds such as methanol and acetone.
","abstract_html":"<p>The reaction rate coefficients between the hydronium ion and the molecules ethene (<em>C<sub>2</sub>H<sub>4</sub></em>), propene (<em>C<sub>3</sub>H<sub>6</sub></em>), 1-butene (<em>C<sub>4</sub>H<sub>8</sub></em>) and hydrogen sulfide (<em>H<sub>2</sub>S</em>) were measured at 296 K. The measured reaction rates were compared to collision rates calculated using average dipole orientation (ADO) theory. Reaction efficiency depends primarily upon the proton affinity of the molecules. All the measurements were obtained using the newly developed microwave cavity discharge flowing afterglow (MCD-FA) apparatus. This device uses an Asmussen-type microwave cavity discharge ion source that is spatially separated from the flow tube, eliminating many of the problems inherent with the original FA devices. In addition to measuring reaction rate coefficients, the MCD-FA was shown to be an effective tool for measuring trace compounds in atmospheric air. This method has many advantages over current detection techniques since compounds can be detected in almost real time, large mass ranges can be scanned quickly, and repeated calibration is not required. Preliminary measurements were made of car exhaust and exhaled alveolar air. Car exhaust showed the presence of numerous hydrocarbons, such as butene, benzene and toluene while the exhaled alveolar air showed the presence of various volatile organic compounds such as methanol and acetone.</p>","abstract_has_math":false,"creators":["Brooke, George M., IV"],"institution":null,"degree_name":"Doctor of Philosophy (PhD)","degree_level":"Dissertation","degree_discipline":"Physics","degree_department":null,"school":null,"contributors":["Leposava Vuskovic","Anatoly V. Radyushkin","Charles I. Sukenik","Paul E. Ulmer","Karl H. Schoenbach"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2003,"date_issued":"2003-04-01T08:00:00Z","date_published":"2003-04-01T08:00:00Z","updated_at":"2026-07-24T03:34:11Z","subjects":["Alkenes","Flowing afterglow","Microwave discharge","Proton transfer","Atmospheric Sciences","Atomic, Molecular and Optical Physics","Physical Chemistry"],"languages":[],"rights":["In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
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"]},{"key":"dc:title","label":"Title","values":["Measurement of Proton Transfer Reaction Rates in a Microwave Cavity Discharge Flowing Afterglow"]}]}],"canonical_facts":{"dc:contributor":["Leposava Vuskovic","Anatoly V. Radyushkin","Charles I. Sukenik","Paul E. Ulmer","Karl H. Schoenbach"],"dc:creator":["Brooke, George M., IV"],"dc:date.available":["2019-02-20T08:00:00Z"],"dc:description.abstract":["The reaction rate coefficients between the hydronium ion and the molecules ethene (C2H4), propene (C3H6), 1-butene (C4H8) and hydrogen sulfide (H2S) were measured at 296 K. The measured reaction rates were compared to collision rates calculated using average dipole orientation (ADO) theory. Reaction efficiency depends primarily upon the proton affinity of the molecules. All the measurements were obtained using the newly developed microwave cavity discharge flowing afterglow (MCD-FA) apparatus. This device uses an Asmussen-type microwave cavity discharge ion source that is spatially separated from the flow tube, eliminating many of the problems inherent with the original FA devices. In addition to measuring reaction rate coefficients, the MCD-FA was shown to be an effective tool for measuring trace compounds in atmospheric air. This method has many advantages over current detection techniques since compounds can be detected in almost real time, large mass ranges can be scanned quickly, and repeated calibration is not required. Preliminary measurements were made of car exhaust and exhaled alveolar air. Car exhaust showed the presence of numerous hydrocarbons, such as butene, benzene and toluene while the exhaled alveolar air showed the presence of various volatile organic compounds such as methanol and acetone.
"],"dc:identifier":["https://digitalcommons.odu.edu/physics_etds/38"],"dc:rights":["In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
"],"dc:subject":["Alkenes","Flowing afterglow","Microwave discharge","Proton transfer","Atmospheric Sciences","Atomic, Molecular and Optical Physics","Physical Chemistry"],"dc:title":["Measurement of Proton Transfer Reaction Rates in a Microwave Cavity Discharge Flowing Afterglow"],"thesis:degree_discipline":["Physics"],"thesis:degree_level":["Dissertation"],"thesis:degree_name":["Doctor of Philosophy (PhD)"]},"updated_at":"2026-07-24T03:34:11Z"}