Rotational relaxation of high-N states of OH(<formula>X2Π, <formula>v=1-3) by <formula>O2

Details Rotational relaxation of high-N states of OH(<formula>X2Π, <formula>v=1-3) by <formula>O2 Rotational relaxation of high-N states of OH(<formula>X2Π, <formula>v=1-3) by <formula>O2

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997jgr...102.4521h&link_type=abstract

Journal of Geophysical Research, Volume 102, Issue A3, p. 4521-4528

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4

Atmospheric Composition And Structure: Airglow And Aurora, Atmospheric Composition And Structure: Middle Atmosphere-Composition And Chemistry, Atmospheric Composition And Structure: Thermosphere-Composition And Chemistry, Meteorology And Atmospheric Dynamics: Mesospheric Dynamics

Scientific paper

We have studied the relaxation of OH(X2Π,v,N) produced by the reaction O(1D)+H2->OH*+H. Infrared emission measurements of the fundamental vibration-rotation band of OH were acquired at a temperature of 100 K in a large cryogenic chamber. Trace amounts of ozone were added to mixtures of H2, O2, and Ar at low (<=38mT) pressures. The ozone was photolyzed to produce O(1D). Rapid reaction with H2 produced OH*. Spectrally and temporally resolved emissions from levels up to the exothermic limit were observed with sufficient spectral resolution to permit kinetic analysis of individual level populations. The production rate was observed to scale as the rotational quantum number except at the highest levels populated. At early times we observed inverted rotational state distributions that subsequently relaxed to form thermal distributions in each vibrational level. Under these conditions, rotational relaxation was rapid in comparison with vibrational relaxation. Rotational relaxation within a given vibrational state could be represented by single quantum collisional exchange at near-gas-kinetic rates. The rotational level dependence of the deduced relaxation was determined.

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