Abstract
A kinetic study of the reaction Na + O2+ He [graphic omitted] NaO2+ He has been carried out in a fast-flow reactor in the temperature and pressure ranges of, respectively, 392–777 K and 4–14 Torr. Sodium atoms are generated either by thermal evaporation of sodium metal or by the technique of microwave-induced plasma afterglow atomization. Atomic absorption spectroscopy is used as the detection technique for atomic sodium. A fit of k2 to the expression A(T/300)n yields k2=(8.6 ± 0.7)× 10–31(T/300)–1.04 ± 0.16 cm6 molecule–2 s–1. This rate expression will be compared with kinetic data derived for the above reaction on the basis of time-resolved flash photolysis and excimer laser photolysis measurements. Using the Troe formalism, values of k2 are calculated in the temperature range 200–2000 K and the importance of the reaction in the burnt-gas region of oxygen-rich flames is discussed.
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