Rate Constant Ratios During Nitrogen Dioxide Photolysis
Open Access
- 1 December 1966
- journal article
- research article
- Published by Taylor & Francis in Journal of the Air Pollution Control Association
- Vol. 16 (12) , 695-696
- https://doi.org/10.1080/00022470.1966.10468535
Abstract
Nitrogen dioxide is the light absorber in the hydrocarbon system leading to production of photochemical air pollution. Studies of the reactions involved are based on the kinetics of nitrogen dioxide photolysis and the values of the rate constants derived therefrom. The photolysis of nitrogen dioxide was investigated in the 2-20 ppm concentration range. The value of the bimolecular rate constant of the reaction between oxygen atoms and nitrogen dioxide was calculated to be 5.26 × 1091 mole–1 sec–1, and thetermolecular rate constant of the reaction between oxygen atoms and nitrogen dioxide in presence of a third body is 4.24 × 10–10 12mole–2 sec–1. The rate constant for the reaction between oxygen atoms and nitric oxide in the presence of a third body was calculated to be 2.31 × 1010 12mole–2 sec–1. Nitrogen was used as the third body. In terms of order of magnitude these calculated rate constants are similar to previously reported values. However, in certain cases their use leads to an oxygen atom concentration which is 100% greater than previously calculated.Keywords
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