Temperature dependence of the photolysis of ozone at 3130 A

Details Temperature dependence of the photolysis of ozone at 3130 A Temperature dependence of the photolysis of ozone at 3130 A

Apr 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975jgr....80.1328k&link_type=abstract

Journal of Geophysical Research, vol. 80, Apr. 1, 1975, p. 1328-1331. U.S. Department of Transportation

Physics

7

Absorption Spectra, Atmospheric Chemistry, Ozone, Photolysis, Temperature Effects, Electromagnetic Absorption, Energy Requirements, Enthalpy, Line Spectra, Molecular Rotation, Radiation Effects, Solar Radiation

Scientific paper

Results of ozone photolysis experiments are reported. The quantum efficiencies for O(1-D) production were found to be 0.29, 0.22, and 0.11 at 293, 258, and 221 K respectively. This temperature dependence was attributed to the vibrational and rotational energy needed in the O3 molecule to surpass the energy requirement for O(1-D) + O2(1-delta) production. Since angular momentum must be conserved during dissociation, only two degrees of rotational freedom are available, and the data are best fitted with a critical rotational-vibrational energy of 0.86 kcal/mol. This leads to a dissociation enthalpy of 24.32 + or - 0.1 kcal/mol for O3 at 0 K.

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