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Laboratory determination of the rate coefficient for three-body recombination of oxygen atoms in nitrogen
Molecular Physics Laboratory, SRI International, Menlo Park, California, USA
Molecular Physics Laboratory, SRI International, Menlo Park, California, USA
Molecular Physics Laboratory, SRI International, Menlo Park, California, USA
Molecular Physics Laboratory, SRI International, Menlo Park, California, USA
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.
Received 29 July 2007; accepted 19 December 2007; published 17 April 2008.
Citation: (2008), Laboratory determination of the rate coefficient for three-body recombination of oxygen atoms in nitrogen, J. Geophys. Res., 113, A04303, doi:10.1029/2007JA012694.
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