{"id":{"repo_id":"unt","oai_identifier":"info:ark/67531/metadc4403"},"canonical_url":"https://search.dev.ndltd.org/etd/unt/info:ark/67531/metadc4403","repository":{"repo_id":"unt","name":"University of North Texas","base_url":"https://digital.library.unt.edu/oai/"},"display":{"title":"Investigation of the Pressure Dependence of SO3 Formation","abstract":"The kinetics of the pressure dependent O + SO2 + Ar reaction have been investigated using laser photolysis resonance fluorescence at temperatures of 289 K, 399 K, 581 K, 699 K, 842 K and 1040 K and at pressures from 30-665 torr. Falloff was observed for the first time in the pressure dependence. Application of Lindemann theory yielded an Arrhenius expression of k(T) = 3.3 x 10-32exp(-992/T) cm6 molecule-1 s-1 for the low pressure limit and k(T) = 8.47 x 10-14exp(-468/T) cm3 molecule-1 s-1 for the high pressure limit at temperatures between 289 and 842 K. The reaction is unusual as it possesses a positive activation energy at low temperature, yet at higher temperatures the activation energy is negative, illustrating a reaction barrier.","abstract_html":"The kinetics of the pressure dependent O + SO2 + Ar reaction have been investigated using laser photolysis resonance fluorescence at temperatures of 289 K, 399 K, 581 K, 699 K, 842 K and 1040 K and at pressures from 30-665 torr. Falloff was observed for the first time in the pressure dependence. Application of Lindemann theory yielded an Arrhenius expression of k(T) = 3.3 x 10-32exp(-992/T) cm6 molecule-1 s-1 for the low pressure limit and k(T) = 8.47 x 10-14exp(-468/T) cm3 molecule-1 s-1 for the high pressure limit at temperatures between 289 and 842 K. The reaction is unusual as it possesses a positive activation energy at low temperature, yet at higher temperatures the activation energy is negative, illustrating a reaction barrier.","abstract_has_math":false,"creators":["Naidoo, Jacinth"],"institution":"University of North Texas","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":["Marshall, Paul, 1960-","Wilson, Angela K."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2003,"date_issued":"2003-12","date_published":"2003-12","updated_at":"2026-07-24T05:35:09Z","subjects":["Sulfur dioxide.","Flash photolysis.","pressure dependence","resonance fluorescence and flash photolysis","Lindemann theory","absorption cross-section","falloff"],"languages":["English"],"rights":["Public","Copyright","Naidoo, Jacinth","Copyright is held by the author, unless otherwise noted. All rights reserved."],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["oclc: 54453366","https://digital.library.unt.edu/ark:/67531/metadc4403/","ark: ark:/67531/metadc4403"],"render_values":[{"text":"oclc: 54453366","href":null,"code":true},{"text":"https://digital.library.unt.edu/ark:/67531/metadc4403/","href":"https://digital.library.unt.edu/ark:/67531/metadc4403/","code":true},{"text":"ark: ark:/67531/metadc4403","href":null,"code":true}]}]},"links":{"outbound_url":"https://doi.org/10.12794/metadc4403","outbound_label":"DOI","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Marshall, Paul, 1960-","Wilson, Angela K."]},{"key":"dc:creator","label":"Author","values":["Naidoo, Jacinth"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2003-12"]},{"key":"dc:publisher","label":"Institution","values":["University of North Texas"]},{"key":"dc:type","label":"Dc Type","values":["Thesis or Dissertation"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Sulfur dioxide.","Flash photolysis.","pressure dependence","resonance fluorescence and flash photolysis","Lindemann theory","absorption cross-section","falloff"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["English"]},{"key":"dc:rights","label":"Dc Rights","values":["Public","Copyright","Naidoo, Jacinth","Copyright is held by the author, unless otherwise noted. All rights reserved."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["oclc: 54453366","doi: 10.12794/metadc4403","https://digital.library.unt.edu/ark:/67531/metadc4403/","ark: ark:/67531/metadc4403"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["The kinetics of the pressure dependent O + SO2 + Ar reaction have been investigated using laser photolysis resonance fluorescence at temperatures of 289 K, 399 K, 581 K, 699 K, 842 K and 1040 K and at pressures from 30-665 torr. Falloff was observed for the first time in the pressure dependence. Application of Lindemann theory yielded an Arrhenius expression of k(T) = 3.3 x 10-32exp(-992/T) cm6 molecule-1 s-1 for the low pressure limit and k(T) = 8.47 x 10-14exp(-468/T) cm3 molecule-1 s-1 for the high pressure limit at temperatures between 289 and 842 K. The reaction is unusual as it possesses a positive activation energy at low temperature, yet at higher temperatures the activation energy is negative, illustrating a reaction barrier."]},{"key":"dc:format","label":"Dc Format","values":["Text"]},{"key":"dc:title","label":"Title","values":["Investigation of the Pressure Dependence of SO3 Formation"]}]}],"canonical_facts":{"dc:contributor":["Marshall, Paul, 1960-","Wilson, Angela K."],"dc:creator":["Naidoo, Jacinth"],"dc:date":["2003-12"],"dc:description":["The kinetics of the pressure dependent O + SO2 + Ar reaction have been investigated using laser photolysis resonance fluorescence at temperatures of 289 K, 399 K, 581 K, 699 K, 842 K and 1040 K and at pressures from 30-665 torr. Falloff was observed for the first time in the pressure dependence. Application of Lindemann theory yielded an Arrhenius expression of k(T) = 3.3 x 10-32exp(-992/T) cm6 molecule-1 s-1 for the low pressure limit and k(T) = 8.47 x 10-14exp(-468/T) cm3 molecule-1 s-1 for the high pressure limit at temperatures between 289 and 842 K. The reaction is unusual as it possesses a positive activation energy at low temperature, yet at higher temperatures the activation energy is negative, illustrating a reaction barrier."],"dc:format":["Text"],"dc:identifier":["oclc: 54453366","doi: 10.12794/metadc4403","https://digital.library.unt.edu/ark:/67531/metadc4403/","ark: ark:/67531/metadc4403"],"dc:language":["English"],"dc:publisher":["University of North Texas"],"dc:rights":["Public","Copyright","Naidoo, Jacinth","Copyright is held by the author, unless otherwise noted. All rights reserved."],"dc:subject":["Sulfur dioxide.","Flash photolysis.","pressure dependence","resonance fluorescence and flash photolysis","Lindemann theory","absorption cross-section","falloff"],"dc:title":["Investigation of the Pressure Dependence of SO3 Formation"],"dc:type":["Thesis or Dissertation"]},"updated_at":"2026-07-24T05:35:09Z"}