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Title: Reaction of HO{sub 2} with ClO: Flow tube studies of kinetics and product formation between 215 and 298 K

Abstract

Rate coefficients for the reaction between HO{sub 2} and ClO radicals were obtained using the discharge-flow/mass-spectrometry technique at total pressures of 1.1--1.7 Torr of He, and between 298 and 215 K. The room-temperature rate constant, determined using seven different combinations of HO{sub 2} and ClO precursors, was found to be (7.1 {+-} 1.8) x 10{sup {minus}12}({+-}2{sigma})cm{sup 3}s{sup {minus}1}. The temperature-dependent overall reaction rate coefficient is described by k{sub (3)} (298--215 K) = (7.1 {+-} 0.4) x 10{sup {minus}12} exp({minus}16 {+-} 17/T) cm{sub 3}s{sup {minus}1}. The previous observation of a strong negative temperature dependence in the title reaction below 298 K was not observed, resulting in a significantly lower rate coefficient at stratospheric temperatures. HOCl was the only product of the reaction, and an upper limit of 1% for the branching ratio for the formation of O{sub 3} and HCl was obtained at the low pressures of these experiments.

Authors:
; ; ; ;
Publication Date:
Research Org.:
Max-Planck-Inst. fur Chemie, Mainz (DE)
OSTI Identifier:
20017286
Resource Type:
Journal Article
Resource Relation:
Journal Name: Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory; Journal Volume: 104; Journal Issue: 8; Other Information: PBD: 2 Mar 2000
Country of Publication:
United States
Language:
English
Subject:
54 ENVIRONMENTAL SCIENCES; OXYCHLORIDES; KINETICS; RADICALS; ATMOSPHERIC CHEMISTRY; PEROXY RADICALS; TEMPERATURE DEPENDENCE

Citation Formats

Knight, G.P., Beiderhase, T., Helleis, F., Moortgat, G.K., and Crowley, J.N. Reaction of HO{sub 2} with ClO: Flow tube studies of kinetics and product formation between 215 and 298 K. United States: N. p., 2000. Web. doi:10.1021/jp9924631.
Knight, G.P., Beiderhase, T., Helleis, F., Moortgat, G.K., & Crowley, J.N. Reaction of HO{sub 2} with ClO: Flow tube studies of kinetics and product formation between 215 and 298 K. United States. doi:10.1021/jp9924631.
Knight, G.P., Beiderhase, T., Helleis, F., Moortgat, G.K., and Crowley, J.N. Thu . "Reaction of HO{sub 2} with ClO: Flow tube studies of kinetics and product formation between 215 and 298 K". United States. doi:10.1021/jp9924631.
@article{osti_20017286,
title = {Reaction of HO{sub 2} with ClO: Flow tube studies of kinetics and product formation between 215 and 298 K},
author = {Knight, G.P. and Beiderhase, T. and Helleis, F. and Moortgat, G.K. and Crowley, J.N.},
abstractNote = {Rate coefficients for the reaction between HO{sub 2} and ClO radicals were obtained using the discharge-flow/mass-spectrometry technique at total pressures of 1.1--1.7 Torr of He, and between 298 and 215 K. The room-temperature rate constant, determined using seven different combinations of HO{sub 2} and ClO precursors, was found to be (7.1 {+-} 1.8) x 10{sup {minus}12}({+-}2{sigma})cm{sup 3}s{sup {minus}1}. The temperature-dependent overall reaction rate coefficient is described by k{sub (3)} (298--215 K) = (7.1 {+-} 0.4) x 10{sup {minus}12} exp({minus}16 {+-} 17/T) cm{sub 3}s{sup {minus}1}. The previous observation of a strong negative temperature dependence in the title reaction below 298 K was not observed, resulting in a significantly lower rate coefficient at stratospheric temperatures. HOCl was the only product of the reaction, and an upper limit of 1% for the branching ratio for the formation of O{sub 3} and HCl was obtained at the low pressures of these experiments.},
doi = {10.1021/jp9924631},
journal = {Journal of Physical Chemistry A: Molecules, Spectroscopy, Kinetics, Environment, amp General Theory},
number = 8,
volume = 104,
place = {United States},
year = {Thu Mar 02 00:00:00 EST 2000},
month = {Thu Mar 02 00:00:00 EST 2000}
}