Decomposition of Ozone by O(1 D )
1966; American Institute of Physics; Volume: 44; Issue: 11 Linguagem: Inglês
10.1063/1.1726595
ISSN1520-9032
AutoresDavid R. Snelling, Vernon D. Baiamonte, Edward J. Bair,
Tópico(s)Atmospheric Ozone and Climate
ResumoPhotometric measurements of ozone decomposition following flash photolysis of O3—inert-gas mixtures are interpreted in terms of the time-dependent quantum yield. Decomposition occurs in time segments which contribute increments to the quantum yield that depend on temperature, pressure, and sample composition. A major portion of the reaction O(1D)+O3→2O2, k≥2.3×109liter/mole·secis complete during the photolysis flash and has no temperature dependence in the range 205°—298°K. Processes which further enhance the quantum yield are much slower and depend on temperature, inert-gas pressure, and composition in a way that has some correlation with the effectiveness of the gas in deactivating vibrationally excited O2†. In N2 a factor of 2 less O3 is decomposed by the end of a flash than in He or Ar, indicating deactivation of the O(1D) by N2. The quantum yield is smaller in N2 than in He or Ar but qualitatively similar in its pressure dependence. Some limitations in accounting for the results by an energy chain mechanism are discussed.
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