The production of O(3P) and ground state OH in the reaction of hydrogen atoms with ozone

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Abstract
The production of significant concentrations of O(3P) in the gas phase reaction of hydrogen atoms with ozone in a fast flow discharge system at 1.1±0.1 Torr total pressure in Ar and at room temperature has been reported earlier. These yields were observed to be independent of the concentration of known deactivators of OH† (v = 9) such as O2 and CO2. We report here the results of detailed studies of the yields of O(3P) and ground state OH(X 2πi)v = 0 (OH) using resonance fluorescence under a wide variety of reaction conditions. It is shown that the highest yields of O(3P), 27±2% of the calculated loss of O3 are observed when H is present in excess and the flow tube is coated with a halocarbon wax. The yields are substantially lower when O3 is present in excess and increases as [O3]0 increases. In addition, in an excess of either reagent, the O(3P) yields are lower when the walls of the flow tube are coated with boric acid, which is known to deactivate the vibrationally excited OH† produced in the initial reaction of H with O3. Addition of NO decreased the yield of O(3P), and increased the yield of OH. These results suggest that secondary reactions of OH†, likely with H and O3, are responsible for the production of O(3P), and that a second primary reaction channel, H+O3→HO2+O(3P) [Eq. (lb)] accounts for ?2% of the net reaction.

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