The reaction of O(1D) with H2O and the reaction of OH with C3H6

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Abstract
N2O was photolyzed at 2139 Å to produce O(1D) atoms in the presence of H2O and CO. The O(1D) atoms react with H2O to produce HO radicals, as measured by CO2 production from the reaction of OH with CO. The relative importance of the various possible O(1D )–H2O reactions is equation image The relative rate constant for O(1D) removal by H2O compared to that by N2O is 2.1, in good agreement with that found earlier in our laboratory. In the presence Of C3H6, the OH can be removed by reaction with either CO or C3H6: equation image From the CO2 yield, k3/k2 = 75,0 at 100°C and 55.0 at 200°C to within ± 10%. When these values are combined with the value of k2 = 7.0 × 10−13exp (–1100/RT) cm3/sec, k3 = 1.36 × 10−11 exp (–100/RT) cm3/sec. At 25°C, k3 extrapolates to 1.1 × 10−11 cm3/sec.