Interstellar negative oxygen

Details Interstellar negative oxygen Interstellar negative oxygen

Aug 1976

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976a%26a....50..473r&link_type=abstract

Astronomy and Astrophysics, vol. 50, no. 3, Aug. 1976, p. 473-476.

Astronomy and Astrophysics

Astrophysics

3

Absorption Spectra, Electron Transitions, Interstellar Gas, Oxygen Ions, Photoionization, Ultraviolet Spectra, Fine Structure, Ground State, Hydroxyl Radicals, Interstellar Extinction, Ionization Potentials, Quantum Mechanics

Scientific paper

The strong 2200 A interstellar absorption band is interpreted as the 2p4(1D)2p 2P0-2p4(1D)3d 2DPS resonance in an O(-) photo-ionization continuum, on the basis of an extrapolation of wave numbers of an iso-electronic sequence. The number of negative oxygen ions per sq cm is found to be about 6 times 10 to the 16th power E(B-V), from a comparison of the strength of the interstellar-extinction discontinuity at the 2p5-2p4(3P)Es O(-) ionization limit with the known absorption coefficient per O(-) ion. The oscillator strength that belongs to the amount of true absorption in the band-wavelength region is then estimated to be of the order of two.

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