Yields of Molecular Hydrogen in the Elementary Reactions HO2 + HO2 and O(1D2) + H2O

Article abstract of DOI:10.1021/j100262a006

The concentration of molecular hydrogen was measured after photolysis of static mixtures of H2O2 vapor in 50 torr of N2 at 298 K.If the products of the reaction HO2 + HO2 are considered to be (1) H2O2 + O2 and (2) H2 + 2O2, then a branching ratio of k₂/k₁<0.0022 was obtained.The branching ratio was obtained by comparing the measured H2 concentration with that predicted by a complete photochemical model.For the reaction of O(¹D2) with H2O the products are thought to be (3) 2OH and (4) H2 + O2.The hydrogen concentration was measured after photolysis of ozone in excess water vapor.A value for k₄/k₃=0.006 (+0.007, -0.006) was obtained at 298 K and 15 torr total pressure.The results are compared with those of other workers.