Detection of forbidden O I 1S-1D in comet IRAS-Araki-Alcock

Details Detection of forbidden O I 1S-1D in comet IRAS-Araki-Alcock Detection of forbidden O I 1S-1D in comet IRAS-Araki-Alcock

Jun 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984icar...58..440c&link_type=abstract

Icarus (ISSN 0019-1035), vol. 58, June 1984, p. 440-445.

Astronomy and Astrophysics

Astronomy

13

Astronomical Spectroscopy, Iras-Araki-Alcock Comet, Line Spectra, Oxygen Spectra, Comet Heads, Electrophotometry, Water, Comets, Iras-Araki-Alcock, Spectra, Observations, Comae, Water, Source, Photoelectric Properties, Oxygen, Diagrams, Data, Analysis

Scientific paper

Spectra of the [O I] 1D-3P "red" doublet and the 1S-1D "green" line in comet IRAS-Araki-Alcock (1983d) were obtained during its close approach to the Earth. This is the first unequivocal photoelectric detection of the green line in a cometary spectrum. The population ratio of the O(1S) state to the O(1D) state in the inner coma is ≤0.03. This ratio eliminates CO or CO2 and points strongly to H2O as the primary parent for excited oxygen atoms.

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