Population ratios for the fine-structure ground state of O I applicable to the interstellar medium

Details Population ratios for the fine-structure ground state of O I applicable to the interstellar medium Population ratios for the fine-structure ground state of O I applicable to the interstellar medium

Oct 1988

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...333..806k&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 333, Oct. 15, 1988, p. 806-808. SERC-supported research.

Astronomy and Astrophysics

Astrophysics

8

Electron States, Fine Structure, Ground State, H I Regions, H Ii Regions, Interstellar Gas, Electron Density Profiles, Gas Density

Scientific paper

Recent R-matrix calculations of electron excitation rates among the 2s22p4 3P fine-structure levels in O I are used to derive density-sensitive population ratios n(3P1)/n(3P2) and n(3P0)/n(3P2) for the ranges of electron and neutral hydrogen densities (ne = 10-2 - 103cm-3; nH = 0 - 1000 cm-3) applicable to H I and H II regions. The results differ significantly from those of Smeding and Pottasch and will lead to electron density estimates between 30% and a factor of 2 smaller.

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