Associative Detachment of O with CO, H2, and O2

J. L. Mauer and G. J. Schulz
Phys. Rev. A 7, 593 – Published 1 February 1973
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Abstract

The associative detachment reactions of O with CO, H2, and O2 are studied experimentally using an ion beam (0-10 eV) impinging on a gas-filled chamber. The resultant electrons are energy analyzed using retarding potentials. At low ion energy, cross sections for total electron detachment for the reactions of O with CO and H2 vary as the inverse of the relative velocity. At higher energies, the cross sections show a broad peak. We interpret this shape in terms of the potential-energy curves of the compound states. The energy distributions for the electrons resulting from the reactions of O with CO and H2 exhibit peaks at low energy corresponding to the excitation of high vibrational and rotational states of the resultant triatomic molecules (CO2, H2O). Progressions observed in these distributions have spacings corresponding to the preferential excitation of the bending modes of the triatomic molecules. The cross section for total electron detachment for the reaction of O with O2 exhibits a threshold near 0.7 eV and rises linearly at higher energy.

  • Received 31 July 1972

DOI:https://doi.org/10.1103/PhysRevA.7.593

©1973 American Physical Society

Authors & Affiliations

J. L. Mauer* and G. J. Schulz

  • Mason Laboratory, Yale University, New Haven, Connecticut 06520

  • *Present address: Joint Institute for Laboratory Astrophysics, University of Colorado, Boulder, Colo. 80302.

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Vol. 7, Iss. 2 — February 1973

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