Laboratory determination of the rate coefficient for three-body recombination of oxygen atoms in nitrogen

Details Laboratory determination of the rate coefficient for three-body recombination of oxygen atoms in nitrogen Laboratory determination of the rate coefficient for three-body recombination of oxygen atoms in nitrogen

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008jgra..11304303p&link_type=abstract

Journal of Geophysical Research, Volume 113, Issue A4, CiteID A04303

Physics

5

Atmospheric Composition And Structure: Middle Atmosphere: Composition And Chemistry, Atmospheric Composition And Structure: Airglow And Aurora, Atmospheric Composition And Structure: Chemical Kinetic And Photochemical Properties, Atmospheric Composition And Structure: Planetary Atmospheres (5210, 5405, 5704), Atmospheric Composition And Structure: Thermosphere: Composition And Chemistry

Scientific paper

A laser-based measurement of the rate coefficient for O-atom three-body recombination at room temperature is reported. The experiment employs the pulsed output of a fluorine laser at 157.6 nm to achieve high degrees of photodissociation of molecular oxygen. In a high-pressure (1 atm) background of N2, the produced oxygen atoms recombine in a timescale of several milliseconds. The O-atom population is monitored by two-photon laser-induced fluorescence at 845 nm, using a second laser with output near 226 nm. The measured value of the rate coefficient is (2.7 +/- 0.3) × 10-33 cm6s-1 (1σ uncertainty), a value a factor of 2 lower than that currently adopted by the atmospheric modeling community.

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