Mechanism for the reaction of CH/sub 2/OO with SO/sub 2/
The gas-phase reaction of CH/sub 2/OO produced by the reaction of ozone with ethylene was investigated. The pressure dependence of the yield of H/sub 2/SO/sub 4/ formed in the reaction of CH/sub 2/OO with SO/sub 2/ was studied in the pressure range of 10-1140 Torr. The H/sub 2/SO/sub 4/ yield (0.40 at the high-pressure limit) decreased as the total pressure decreased but did not fall to zero even at low pressure, which implies that stabilized ground-state CH/sub 2/OO species are formed at low pressure as a primary product. Vibrationally excited CH/sub 2/OO double dagger as well as another excited CH/sub 2/OO*, which does not suffer collisional stabilization even at the highest pressure studied, is also produced in the reaction. The formation ratio was obtained as CH/sub 2/OO:CH/sub 2/OO double dagger:CH/sub 2/OO *= 0.20:0.20:0.60. The ratio of the rate constant for collisional deactivation of CH/sub 2/OO with air to that for decomposition for CH/sub 2/OO double dagger was determined to be (1.0 +/- 0.9) x 10/sup -19/ cm/sup 3//molecule. As for the reaction mechanism for the reaction of CH/sub 2/OO with SO/sub 2/, the formation of adduct between CH/sub 2/OO and SO/sub 2/ was concluded. The adduct is proposed to react with another SO/sub 2/ molecule to produce HCHO and SO/sub 3/ or to decompose to HCOOH and SO/sub 2/ with the rate constant ratio of (4.9 +/- 2.0) x 10/sup -15/ cm/sup 3//molecule.
- Research Organization:
- National Institute for Environmental Studies, Tsukuba-gakuen, Japan
- OSTI ID:
- 5470583
- Journal Information:
- J. Phys. Chem.; (United States), Journal Name: J. Phys. Chem.; (United States) Vol. 90:17; ISSN JPCHA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
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54 ENVIRONMENTAL SCIENCES
ACID RAIN
ALKENES
ATMOSPHERIC PRECIPITATIONS
CHALCOGENIDES
CHEMICAL REACTIONS
DATA
ETHYLENE
EXPERIMENTAL DATA
FLUIDS
GASES
HYDROCARBONS
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
NUMERICAL DATA
ORGANIC COMPOUNDS
OXIDES
OXYGEN COMPOUNDS
OZONE
PRESSURE DEPENDENCE
RAIN
REACTION INTERMEDIATES
SULFUR COMPOUNDS
SULFUR OXIDES
SULFURIC ACID