Rate constant and products of the reaction between NO sub 3 and ClO over the temperature range 353-210 K

Journal Article · Thu Oct 03 00:00:00 EDT 1991 · Journal of Physical Chemistry; (United States)

DOI:https://doi.org/10.1021/j100173a037· OSTI ID:7273756

Biggs, P; Harwood, M H; Parr, A D; Wayne, R P ^[1]

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1. Physical Chemistry Lab., Oxford (United Kingdom)

The rate constant for the reaction between NO{sub 3} and ClO has been examined at 1.4 Torr over a range of temperature (T = 353 {minus} 210K) by using a discharge-flow apparatus. The rate constant for the reaction has been found to be temperature independent, with a mean value over all temperatures of k{sub 1}= (5.0 {plus minus} 1.4) {times} 10{sup {minus}13} cm{sup 3} molecule{sup {minus}1} s{sup {minus}1} (where the errors represent 95% confidence limits, precision only). The approximate ratios for branching into the following channels have been investigated: NO{sub 3} + ClO {yields} ClOO + NO{sub 2} (1a); NO{sub 3} + ClO {yields} OClO + NO{sub 2} (1b). At T = 296 K, the ratio k{sub 1a}/k{sub 1} was determined to be 0.9 {plus minus} 0.35. The ratio k{sub 1b}/k{sub 1} was studied at several temperatures and was found to be 0.2 {plus minus} 0.1 at T = 297 K, decreasing with decreasing temperature. No products other than OClO and ClOO (observed indirectly) were detected. Comparisons were made with other studies of the reaction, and some possible implications of OClO formation in polar stratospheres are discussed.

• OSTI ID: 7273756
• Journal Information: Journal of Physical Chemistry; (United States), Journal Name: Journal of Physical Chemistry; (United States) Vol. 95:20; ISSN JPCHA; ISSN 0022-3654
• Country of Publication: United States
• Language: English

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