ABSOLUTE RATE CONSTANT FOR THE REACTION OH (V = O)+O3-]HO2 +O2 OVER THE TEMPERATURE-RANGE 238-DEGREES-K-357-DEGREES-K

The technique of laser flash photolysis-resonance fluorescence has been employed to measure absolute rate constants for the reaction OH (v = 0)+O 3→HO2+O2 over the temperature range 238-357 K. The results are described by the Arrhenius expression k = 1.82 -0.29+0.35×10-12 exp[(-930±50)/T] cc/molecule s. Extrapolation of this expression to 225 K, the temperature of the stratosphere in the region where O3 levels are highest, gives a rate constant which is ∼65% higher than the currently recommended value. © 1979 American Institute of Physics.