On the Role of Vibrationally Excited H2 as a Source of OH in the Mesosphere

Details On the Role of Vibrationally Excited H2 as a Source of OH in the Mesosphere On the Role of Vibrationally Excited H2 as a Source of OH in the Mesosphere

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004agufmsa11a1108n&link_type=abstract

American Geophysical Union, Fall Meeting 2004, abstract #SA11A-1108

Physics

0310 Airglow And Aurora, 0317 Chemical Kinetic And Photochemical Properties, 0340 Middle Atmosphere: Composition And Chemistry, 0342 Middle Atmosphere: Energy Deposition, 0343 Planetary Atmospheres (5405, 5407, 5409, 5704, 5705, 5707)

Scientific paper

It has recently been suggested that1 the reaction between vibrationally excited H2(v=1) and O(3P) atoms may be an important source of OH in the upper mesosphere. Here, we report accurate quantum calculations of rate coefficients for the O(3P)+H2(v=1) reaction and show that the proposed mechanism is not an important source of OH in the mesosphere2. The reaction of vibrationally excited H2(v=1-3) with oxygen atoms has also been suggested as a source of OH in photon dominated regions of the interstellar medium. We present results for v=2 and 3 of the H2 molecule using chemically accurate potential energy surfaces for the O+H2 system and quantum mechanical method for the calculation of the relevant cross sections and rate coefficients. This work was supported by NSF grant No. ATM-0205199. 1 L. M. Reynard and D. J. Donaldson, Geophys. Res. Lett. 28, 2157 (2001). 2 N. Balakrishnan, Geophys. Res. Lett. 31, L04106 (2004).

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