Abstract

Three-body rate coefficients for reactions of H+O 2 +M where M=N 2 and H 2 O have been measured in a high-temperature flow reactor as a function of temperature up to 750 K. Room-temperature rate coefficients for M=Ar have also been quantified. The rate coefficients are measured by the flash photolysis method where atomic hydrogen is produced by excimer laser photolysis of precursor molecules (H 2 S or H 2 O) and then probed by either laser-induced fluorescence or resonance absorption. The rate coefficient measurements for nitrogen (298-580 K) can be described by the Arrhenius expression k N2 =(2.9±0.8)×10 -33 exp[(825±130)/T] cm 6

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