Energy Spectra of Metastable Oxygen Atoms Produced by Electron-Impact Dissociation of O2

Details Energy Spectra of Metastable Oxygen Atoms Produced by Electron-Impact Dissociation of O2 Energy Spectra of Metastable Oxygen Atoms Produced by Electron-Impact Dissociation of O2

Jul 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971phrva...4..153b&link_type=abstract

Physical Review A, vol. 4, Issue 1, pp. 153-161

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Scientific paper

Kinetic energies of metastable O atoms formed in dissociative excitation of O2 were measured by a time-of-flight experiment. Metastable O(5S0) atoms (9.14 eV) as well as high-lying states near the ionization limit of O (13.6 eV) were detected by means of Auger ejection of secondary electrons from a Cu-Be surface. The energy spectra of metastable fragments showed distinct structure with maxima near 0.3 and 2eV. Repulsive-potential-energy curves of O2 were constructed from the measured energy spectra and time-resolved excitation functions. The excitation function for the direct excitation of the O(5S0) state had a threshold of 14.3 +/- 0.2 eV which is equal to the minimum energy for dissociatively exciting the O(5S0) state. Using selection rules and symmetry arguments concerning the angular variation of dissociation products, the molecular state reached near 14.3 eV was identified as a Πu state with a probable multiplicity of 3. Other molecular states reached at higher energies were not identified. It seems, however, that there was a sizable contribution due to O atoms in high-lying Rydberg states excited in dissociative excitation. The differential cross section for the direct formation of O(5S0) was found to be dσdΩ~=1×10-19 cm2/sr within a factor of 2 at an electron energy of 30 eV and an angle of 90° with respect to the electron beam. Several atmospheric applications of the measurements concerning the heating of the atmosphere, radiative transfer of resonance radiation, and chemical reactions are mentioned briefly.

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