Temperature dependence of association reactions studied near 0 Kelvin

Persistent Link:
http://hdl.handle.net/10150/289082
Title:
Temperature dependence of association reactions studied near 0 Kelvin
Author:
Steinhurst, Daniel Aaron
Issue Date:
1999
Publisher:
The University of Arizona.
Rights:
Copyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.
Abstract:
Termolecular association reactions were studied at the low temperatures produced within the core of a free jet expansion. A strong inverse temperature dependence was found in the termolecular association rate coefficients for the reactions of NO⁺ with NO and N₂ and the results are compared with existing literature and theories. The atmospheric ramifications of the reaction NO⁺ + 2 N₂ are discussed. The temperature dependence of the termolecular association reaction of H⁺ + 2 H₂ is reported for the range 1.6-3 Kelvin and a temperature dependent rate coefficient for the range 1.6-300 Kelvin is reported using the current results and the available high temperature literature. Measurement of the autoneutralization lifetime of SF₆⁻* formed by the attachment of low energy (1-100 meV) electrons to cold SF₆ molecules within the core of a free jet expansion were made. The excited anions were found to exhibit a single lifetime in accordance with the s-wave scattering law and with literature values for the temperature dependence of both the electron attachment rate coefficient and excited anion lifetime. These studies provide insight into the attachment/detachment dynamics of negative ion scattering states under single collision conditions. The effect of neutral temperature on termolecular association reactions is examined for several chemical systems and discussed within the context of models which include the formation of a long-lived collision complex.
Type:
text; Dissertation-Reproduction (electronic)
Keywords:
Chemistry, Physical.
Degree Name:
Ph.D.
Degree Level:
doctoral
Degree Program:
Graduate College; Chemistry
Degree Grantor:
University of Arizona
Advisor:
Smith, Mark A.

Full metadata record

DC FieldValue Language
dc.language.isoen_USen_US
dc.titleTemperature dependence of association reactions studied near 0 Kelvinen_US
dc.creatorSteinhurst, Daniel Aaronen_US
dc.contributor.authorSteinhurst, Daniel Aaronen_US
dc.date.issued1999en_US
dc.publisherThe University of Arizona.en_US
dc.rightsCopyright © is held by the author. Digital access to this material is made possible by the University Libraries, University of Arizona. Further transmission, reproduction or presentation (such as public display or performance) of protected items is prohibited except with permission of the author.en_US
dc.description.abstractTermolecular association reactions were studied at the low temperatures produced within the core of a free jet expansion. A strong inverse temperature dependence was found in the termolecular association rate coefficients for the reactions of NO⁺ with NO and N₂ and the results are compared with existing literature and theories. The atmospheric ramifications of the reaction NO⁺ + 2 N₂ are discussed. The temperature dependence of the termolecular association reaction of H⁺ + 2 H₂ is reported for the range 1.6-3 Kelvin and a temperature dependent rate coefficient for the range 1.6-300 Kelvin is reported using the current results and the available high temperature literature. Measurement of the autoneutralization lifetime of SF₆⁻* formed by the attachment of low energy (1-100 meV) electrons to cold SF₆ molecules within the core of a free jet expansion were made. The excited anions were found to exhibit a single lifetime in accordance with the s-wave scattering law and with literature values for the temperature dependence of both the electron attachment rate coefficient and excited anion lifetime. These studies provide insight into the attachment/detachment dynamics of negative ion scattering states under single collision conditions. The effect of neutral temperature on termolecular association reactions is examined for several chemical systems and discussed within the context of models which include the formation of a long-lived collision complex.en_US
dc.typetexten_US
dc.typeDissertation-Reproduction (electronic)en_US
dc.subjectChemistry, Physical.en_US
thesis.degree.namePh.D.en_US
thesis.degree.leveldoctoralen_US
thesis.degree.disciplineGraduate Collegeen_US
thesis.degree.disciplineChemistryen_US
thesis.degree.grantorUniversity of Arizonaen_US
dc.contributor.advisorSmith, Mark A.en_US
dc.identifier.proquest9960280en_US
dc.identifier.bibrecord.b40273672en_US
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