Abstract
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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