Theoretical study of the H+O3↔OH+O2↔ O+HO2 system

Michel Dupuis, G. Fitzgerald, B. Hammond, W. A. Lester, H. F. Schaefer

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Abstract

The key features of the H+O3 potential energy surface have been determined using ab initio quantum mechanical methods. The electronic wave function used is a multiconfiguration Hartree-Fock wave function which provides a qualitatively correct description of various reactive channels. It is found that the H+O3→HO+O2 reaction proceeds along a nonplanar pathway in which the H atom descends vertically to the plane containing the ozone molecule to form an HO3 intermediate which then undergoes fragmentation. No planar transition state for a direct O-atom abstraction could be located. The radical-radical O+HO2 reaction was found to have no energy barrier to formation of HO3 which was determined to subsequently decompose to HO+O2. The H-atom abstraction reaction O+HO2→OH+O2 was found to have a small activation energy. The dynamical implications of these findings are discussed. The results are consistent with the observed vibrational excitation of the OH product in the H+O3 reaction. The key features of the H+O3 potential energy surface are expected to be transferable to the X+O3 systems where X=Cl, OH, NO, and NH2.

Original languageEnglish
Pages (from-to)2691-2697
Number of pages7
JournalJournal of Chemical Physics
Volume84
Issue number5
Publication statusPublished - 1985

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ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Cite this

Dupuis, M., Fitzgerald, G., Hammond, B., Lester, W. A., & Schaefer, H. F. (1985). Theoretical study of the H+O3↔OH+O2↔ O+HO2 system. Journal of Chemical Physics, 84(5), 2691-2697.