Study of the reaction of ClO + CH sub 3 O sub 2 yields products at 300 K
- Max-Planck-Institut fuer Chemie, Mainz (Germany, F.R.)
The first experimental study of the reaction ClO + CH{sub 3}O{sub 2} {yields} products (1) is reported. The rate coefficient k{sub 1} and the product distributions were investigated in the modulated photolysis of Cl{sub 2}/CH{sub 4}/Cl{sub 2}O/O{sub 2} mixtures. Reactants and products have been monitored by using UV-vis and Fourier-transform infrared gas-phase absorption spectroscopies. The value of k{sub 1} was found to be equal to (3.1 {plus minus} 1.7) {times} 10{sup {minus}12} cm{sup 3} molecule{sup {minus}1} s{sup {minus}1} at 300 K and 240 Torr total pressure. The product channel forming ClOO and CH{sub 3}O appears to be the dominant pathway at 300 K. The subsequent oxidation of CH{sub 3}O to CH{sub 2}O and its partial photolysis into H and HCO leads to enhanced production of odd hydrogen (OH, HO{sub 2}) radicals. Consequently, high concentrations of OH radicals can build up, leading to an additional source of active chlorine via the reaction HCl + OH {yields} Cl + H{sub 2}O, which destroys ozone by catalytic reactions. This strongly suggests that reaction 1 can play a substantial role in the photochemical processes that take place under stratospheric ozone hole conditions.
- OSTI ID:
- 7246545
- Journal Information:
- Journal of Physical Chemistry; (USA), Journal Name: Journal of Physical Chemistry; (USA) Vol. 93:23; ISSN JPCHA; ISSN 0022-3654
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
400000* -- Chemistry
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54 ENVIRONMENTAL SCIENCES
540100 -- Environment
Atmospheric-- (1990-)
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CHALCOGENIDES
CHEMISTRY
CHLORINE COMPOUNDS
CHLORINE OXIDES
DATA
EXPERIMENTAL DATA
HALOGEN COMPOUNDS
INFORMATION
KINETICS
MEASURING INSTRUMENTS
MEASURING METHODS
MEDIUM TEMPERATURE
NUMERICAL DATA
OXIDES
OXYGEN COMPOUNDS
OZONE
PHOTOCHEMISTRY
REACTION KINETICS