Collisional removal of O2(b1Σg+, υ = 1) by O2 at thermospheric temperatures

Details Collisional removal of O2(b1Σg+, υ = 1) by O2 at thermospheric temperatures Collisional removal of O2(b1Σg+, υ = 1) by O2 at thermospheric temperatures

Mar 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005jgra..11003308p&link_type=abstract

Journal of Geophysical Research, Volume 110, Issue A3, CiteID A03308

Physics

6

Atmospheric Composition And Structure: Airglow And Aurora, Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Middle Atmosphere: Composition And Chemistry, Atmospheric Composition And Structure: Thermosphere: Composition And Chemistry

Scientific paper

Collisional removal of O2(b1Σg+, υ = 1) by O2 is investigated at temperatures relevant to the lower thermosphere. A two-laser technique is used, in which the visible output of the first laser directly excites ground-state oxygen molecules to the υ = 1 level of the b1Σg+ state and the ultraviolet output of the second laser probes the O2(b1Σg+, υ = 1) population by resonantly enhanced multiphoton ionization via the υ = 4 level of the d1Πg Rydberg state. The collisional removal rate coefficient increases with temperature by a factor of five in the range 300-1000 K, with a value of about 8 × 10-11 cm3 s-1 near 1000 K. Given the magnitude of the rate coefficient, the removal by O2 plays a dominant role in controlling the population of O2(b1Σg+, υ = 1) in the mesosphere and lower thermosphere at altitudes below 150 km and likely continues to be an important removal pathway at altitudes up to about 200 km.

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