Kinetic measurements of the ClO + O sub 3 yields ClOO + O sub 2 reaction
- Harvard Univ., Cambridge, MA (USA)
Upper limits for the bimolecular rate constant for the reaction ClO + O{sub 3} {yields} ClOO + O{sub 2} have been measured directly between 233 and 413 K using a discharge-flow system at 1-2 torr total pressure. Production of ClO (which occurs quickly after thermal decomposition of ClOO in the presence of O{sub 3}) was detected using Laser Magnetic Resonance spectroscopy, and distinguished from the reactant ClO through isotopic oxygen labeling. At 298 and 233 K, k{sub 1} was found to be less than 1.4 {times} 10{sup {minus}17} cm{sup 3} molecule{sup {minus}1} s{sup {minus}1}. At 413 K, k{sub 1} = (4.0 {plus minus} 2.0) {times} 10{sup {minus}16} cm{sup 3} molecule{sup {minus}1} s{sup {minus}1}. The experimental conditions were modelled using a kinetic simulation program to show that chemical and isotopic scrambling interferences were negligible. From these results, it is concluded that this bimolecular reaction does not contribute significantly to the observed ozone depletion within the antarctic vortex.
- OSTI ID:
- 5991663
- Journal Information:
- Geophysical Research Letters (American Geophysical Union); (USA), Journal Name: Geophysical Research Letters (American Geophysical Union); (USA) Vol. 17:9; ISSN 0094-8276; ISSN GPRLA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540110*
ANTARCTIC REGIONS
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHEMICAL REACTIONS
CHLORINE COMPOUNDS
CHLORINE OXIDES
ELEMENTS
HALOGEN COMPOUNDS
ISOTOPE APPLICATIONS
ISOTOPES
KINETICS
LASER SPECTROSCOPY
LAYERS
LOSSES
LOW PRESSURE
MATHEMATICAL MODELS
MEDIUM TEMPERATURE
NONMETALS
OXIDES
OXYGEN
OXYGEN COMPOUNDS
OXYGEN ISOTOPES
OZONE
OZONE LAYER
PHOTOCHEMICAL REACTIONS
POLAR REGIONS
REACTION KINETICS
SPECTROSCOPY
TRACER TECHNIQUES
VORTICES