OH production from the reaction of vibrationally excited H2 in the mesosphere

Details OH production from the reaction of vibrationally excited H2 in the mesosphere OH production from the reaction of vibrationally excited H2 in the mesosphere

Jun 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001georl..28.2157r&link_type=abstract

Geophysical Research Letters, Volume 28, Issue 11, p. 2157-2160

Physics

12

Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry

Scientific paper

We propose a novel mechanism for OH production in the mesosphere (50-100 km): the reaction of ground state oxygen atoms with vibrationally excited H2, which is formed via collisional energy transfer from O2(b1Σg+). Using published rate coefficients and altitude profiles for the chemical species involved, the contribution of this new mechanism to the total OH production rate has been estimated as a function of altitude. At altitudes above 75 km, the proposed reactions are as important as the reaction of water with excited state oxygen atoms, O(1D). The fraction of total OH produced from the proposed mechanism is estimated to reach 16% at 100 km.

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