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A spectroscopic study of the equilibrium NO2 + NO3 + M 2 N2O5 + M and the kinetics of the O3/N2O5/NO3/NO2/ air system

✍ Scribed by J. Hjorth; J. Notholt; G. Restelli

Publisher: John Wiley and Sons
Year: 1992
Tongue: English
Weight: 865 KB
Volume: 24
Category: Article
ISSN: 0538-8066
DOI: 10.1002/kin.550240107

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✦ Synopsis

The equilibrium constant, K,, of the reaction NO2 + NO3 + M N z O ~ + M has been determined for a small range of temperatures around room temperature in air at 740 torr by direct spectroscopical measurements of NOz, NOS, and NzOs. At 298 K, K, was determined as (3.73 2 0.61) x lo-'' cm3 molecule-'. Averaging this and 11 other independent evaluations of K, yields K. , = (3.31 f 0.82) x lo-" cm3 molecule-', where the uncertainty is given as one standard deviation. The kinetics of the 03/NOz/Nz05/N03/air system was studied in a static chamber at room temperature and 740 torr total pressure. Evidence of a unimolecular decay reaction of NO3, NO3 + NO + Oz, was found and its rate coefficient was estimated as (1.6 2 0.7) x s-' at 295 2 2 K.

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