Abstract
Trace concentrations of ozone and nitrogen dioxide in pure, dry air at atmospheric pressure were exposed to a known intensity of 3660 A radiation in a stirred flow reactor at 300°K. An increase of steady-state concentrations of ozone and nitrogen dioxide above their dark values was observed and measured. A value of k7Keq=0.44 sec—1 (NO3+NO→2NO2, k7, NO2+NO3⇌N2O5, Keq) was obtained from the data using a postulated mechanism. The good agreement between this value and the values of 1.0 sec—1 obtained by I. C. Hisatsune, B. Ogg, and R. A. Crawford [J. Am. Chem. Soc. 79, 4648 (1957)] supports the validity of the proposed mechanism.
Published Version
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