Laboratory studies of heavy ozone
Abstract
Dissociation of ozone in the Chappuis bands has been used as an O atom source to study isotope effects occurring in the O(3P)+O2(3∑g) recombination reaction. The ozone produced was found to be enriched in both of its heavy isotopes. The pressure dependence (5-1000 torr) and temperature dependence (127-360 K) of this isotope effect have been investigated. The enrichment is approximately constant from 5 torr to 100 torr and decreases at higher pressures. It increases with temperature, with 50O3 showing a slightly faster rate of increase than 49O3. The results of this experiment have clearly isolated the source of the isotope effect to the gas phase O(3P) + O2(3∑g) recombination reaction. For comparison, we also present isotope ratios of ozone formed in an electric discharge. None of the results, however, have shown the large enhancement of 40% or more in mass 50 observed in some stratospheric measurements.
- Publication:
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Journal of Geophysical Research
- Pub Date:
- January 1990
- DOI:
- 10.1029/JD095iD01p00901
- Bibcode:
- 1990JGR....95..901M
- Keywords:
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- Atmospheric Composition and Structure: Middle atmosphere-composition and chemistry