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Kinetics of the reactions of Cl(2PJ) and Br(2P3/2) with O3

✍ Scribed by J. M. Nicovich; K. D. Kreutter; P. H. Wine

Publisher
John Wiley and Sons
Year
1990
Tongue
English
Weight
938 KB
Volume
22
Category
Article
ISSN
0538-8066

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✦ Synopsis

A laser flash photolysis-resonance fluorescence technique has been employed to study the kinetics of the important stratospheric reactions Cl('P,) + O 3 C10 + O2 and Br('P,,,) + O3 -+ BrO + O2 as a function of temperature, The temperature dependence observed for the Cl('P,) + O3 reaction is nonArrhenius, but can be adequately described by the following two Arrhenius expressions (units are cm3 molecule-' s-', errors are 217 and represent precision only): k l ( T ) = (1.19 2 0.21) x lo-" exp [(-33 2 37)/T] for T = 189-269K and k,(T) = (2.49 2 0.38) x lo-'' exp[(-233 f 4 6 ) / n for T = 269-385 K. At temperatures below 230 K,

the rate coefficients determined in this study are faster than any reported previously. Incorporation of our values for k,(T) into stratospheric models would increase calculated C10 levels and decrease calculated HCI levels; hence the calculated efficiency of C10, catalyzed ozone destruction would increase. The temperature dependence observed for the Br('P3 ') + NICOVICH, KREUTTER, AND WINE

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