Rate constants for the reactions of CH3O2 with HO2, NO and NO2 using molecular modulation spectrometry
- 1 January 1980
- journal article
- research article
- Published by Royal Society of Chemistry (RSC) in Journal of the Chemical Society, Faraday Transactions 2: Molecular and Chemical Physics
- Vol. 76, 153-163
- https://doi.org/10.1039/f29807600153
Abstract
Molecular modulation spectrometry has been employed to obtain new measurements of the rate constants for three reactions of the CH3O2 radical in the gas phase. CH3O2 was produced by photolysis of Cl2 in the presence of CH4 and O2 and was measured in absorption at 250 nm. With added H2, HO2 was also produced and kinetic data were obtained under pseudo second-order conditions for the reaction: CH3O2+ HO2= CH3O2H + O2(4), k4=(7.7+18.4 –5.4)× 10–14 exp[(1296 ± 364)/T] cm3 molecule–1 s–1 over the range 275–338 K. The reactions of CH3O2 with NO and NO2 were studied under pseudo first-order conditions and the following rate constants obtained; CH3O2+ NO = CH3O + NO2(2), k2=(6.5 ± 2.0)× 10–12 cm3 molecule–1 s–1 at 298 K and 540 Torr; CH3O2+ NO2= CH3O2NO2(3), 1012k3= 1.6 ± 0.3 and 1.2 ± 0.3 cm3 molecule–1 s–1 at 540 Torr N2 and 50 Torr Ar + CH4, respectively.Keywords
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