The splitting of the 2s(2)2p(3) 2P term in O II

Details The splitting of the 2s(2)2p(3) 2P term in O II The splitting of the 2s(2)2p(3) 2P term in O II

Jun 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...293..459d&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 293, June 15, 1985, p. 459-462.

Mathematics

Probability

19

Forbidden Transitions, Line Spectra, Oxygen Spectra, Planetary Nebulae, Atomic Energy Levels, Wavelengths

Scientific paper

The O II 2p3 2P(1/2)-2P(3/2) and 2D(3/2)-2D(5/2) splitting in high-dispersion long-slit CCD spectra of the bright planetary nebula NGC 7027 has been measured. Techniques used to deblend the 2D(5/2)-2P(3/2),(1/2), 2D(3/2)-2P(3/2,1/2) pairs of lines are described and applied to the data. Accurate separations of the 2P, 2D levels are determined to be 2.00 + or -0.03/cm and 20.11 + or -0.07/cm, respectively. Improved energy level values and improved wavelengths for forbidden O II are listed. The appropriate forbidden O II 2p3 2P line ratios can provide good estimates of the density in the plasma and reddening along the line of sight. The 2P(1/2)-2P(3/2) transition at 60 GHz falls within an atmospheric O2 band at the same frequency and has a rather small transition probability, so it is unlikely to be observable.

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