Electron impact excitation of the O I lambda 1172.6 A multiplet

Details Electron impact excitation of the O I lambda 1172.6 A multiplet Electron impact excitation of the O I lambda 1172.6 A multiplet

Nov 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986p%26ss...34.1155e&link_type=abstract

Planetary and Space Science (ISSN 0032-0633), vol. 34, Nov. 1986, p. 1155-1158.

Computer Science

12

Atmospheric Radiation, Atomic Excitations, Electron Impact, Oxygen Atoms, Upper Atmosphere, Dissociation, Molecular Spectra, Ultraviolet Radiation

Scientific paper

The cross section for the dissociative excitation of the O I 1172.6 A multiplet is measured by the bombardment of O2 by 100 eV electrons. A cross section value of about 1.56 x 10 to the -22nd sq cm + or - 30 percent and an O I 1173 A/O I 989 A branching ratio of about 0.00013 + or - 35 percent are obtained. The branching ratio values are compared to the data of Morrison (1985) and Garstang (1961). The data reveal that the 1173 A branch from the O I (3s prime 3D0) state is not large enough to account for the discrepancy between the predicted and observed O I 989 A intensity in the earth's upper atmosphere.

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