2006
DOI: 10.1021/jp055863z
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Temperature Dependence of O + OH at 136−377 K Using Ozone Photolysis

Abstract: Ozone was photolyzed at 248 nm in 40 Torr nitrogen with small amounts of water or hydrogen added in a cooled or heated flow cell, to measure the O + OH rate constant at 136-377 K. Rate constant values were determined by kinetic modeling of the OH decays in excess O as monitored by laser-induced fluorescence and are in reasonable agreement with current recommendations. Results may be summarized by the expression k = 11.2 x 10(-11) T(-.32) e(177/T) cm3/molecule/s.

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Cited by 24 publications
(18 citation statements)
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“…As a consequence, the HO 2 system has been the topic of numerous electronic structure calculations of its potential energy surface [10,11,12,13,14,15] as well as dynamics calculations to evaluate its temperature dependent rate coefficients [13,14,16,17,18,19,20,21,22,23,24,25,26]. The reaction has also been the focus of a large number of experimental measurements [27,28,29,30,31,32,33,34,35,36]. However, there still remains significant discrepancy between measured and computed values of its rate coefficients for temperatures below 200 K, which is the most important region for astrophysical and upper atmospheric applications.…”
Section: Introductionmentioning
confidence: 99%
“…As a consequence, the HO 2 system has been the topic of numerous electronic structure calculations of its potential energy surface [10,11,12,13,14,15] as well as dynamics calculations to evaluate its temperature dependent rate coefficients [13,14,16,17,18,19,20,21,22,23,24,25,26]. The reaction has also been the focus of a large number of experimental measurements [27,28,29,30,31,32,33,34,35,36]. However, there still remains significant discrepancy between measured and computed values of its rate coefficients for temperatures below 200 K, which is the most important region for astrophysical and upper atmospheric applications.…”
Section: Introductionmentioning
confidence: 99%
“…However, the reaction rate constant of NO 2 with OH⅐ is approximately 3 orders of magnitude smaller than that of O with OH⅐. 43,45 This could explain why there were no measurable changes in the NO x concentrations in this study. Table 1 presents O 3 concentrations measured at 0-and 75-kW engine loads.…”
Section: Removal Of N-alkanes and 16 Pahsmentioning
confidence: 70%
“…This increase for OH + O (plus an increase in OH + HO 2 ) was also recommended to explain the new Aura HOx data [ Canty et al , 2006] and thus our optimization on the old data supports this result. Some new laboratory measurements also suggest a larger rate constant for OH + O at low temperatures [ Robertson and Smith , 2006].…”
Section: Multiple Solutionsmentioning
confidence: 99%