The flash photolysis resonance fluorescence technique has been used to measure the rate constant for the reaction products over the temperature range 225–443 K. The data below room temperature can be fit to the expression k1 = (1.05±0.40) × 1014 exp [(759±100)/T] cm3 molec−1 S−1. This equation, however, markedly underestimates the values of k1 above 300 K. An interpretation of the behavior is presented, and implications of these values for k1 on stratospheric reaction cycles are discussed.

The flash photolysis resonance fluorescence technique has been used to measure the rate constant for the reaction k i OH + HzOz -+ HOz + HzO over the temperature range of 250-370 K. The present results are in excellent agreement with three very recent studies, and the combined data set can been used to derive the expressionsimilar to that currently used in atmospheric modeling applications. A summary of our computer simulation of this reaction system is presented. The results of the computations indicate the absence of secondary reaction complications in the present work while revealing significant problems in the earlier (pre-1980) studies of the title reaction.

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