Rate Constant for OH + O = H + O2

Details Rate Constant for OH + O = H + O2 Rate Constant for OH + O = H + O2

Dec 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001agufmsa41b0726s&link_type=abstract

American Geophysical Union, Fall Meeting 2001, abstract #SA41B-0726

Physics

0317 Chemical Kinetic And Photochemical Properties, 0340 Middle Atmosphere: Composition And Chemistry

Scientific paper

The reaction of OH (v=0) with O atoms is one of 3 radical-radical processes controlling HOx concentrations in the mesosphere. Disagreements of modeling results with recent observations have prompted suggestions of a higher reaction rate than recommended from previous determinations. We measured this rate constant at 295K in excess O prepared by complete excimer laser photodissociation of ozone. OH (v=0) time decay is monitored using laser induced fluorescence after its formation by O(D) reaction with water. Ozone levels are measured by absorption. Rate constant values are derived by computer modeling of the kinetics with sensitivity analysis, including OH vibrational relaxation, diffusion, and chemical regeneration. Sixty four experiments at varying pressure, water, and ozone concentrations give a consistent value of 3.2+/- 0.3 x 10(-11) cm3/s, in agreement with the current NASA panel recommendation. Supported by NASA Ionospheric Thermospheric & Mesospheric Physics Program

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