Fine-structure population ratios for the 2P ground state of C II

Details Fine-structure population ratios for the 2P ground state of C II Fine-structure population ratios for the 2P ground state of C II

May 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986mnras.220..571k&link_type=abstract

Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 220, May 15, 1986, p. 571-576. Research supported by th

Astronomy and Astrophysics

Astronomy

41

Astronomical Spectroscopy, Atomic Excitations, Carbon, Fine Structure, Ground State, Transition Probabilities, H Ii Regions, Hydrogen, Interstellar Gas, Planetary Nebulae, Silicon, Spectrum Analysis, Ultraviolet Spectra

Scientific paper

Results of R-matrix calculations of electron excitation rates for the 2s22p2P1/2-2s22p2P3/2 fine-structure transition in C II are used to derive density sensitive population ratios n(2s22p2P3/2)/n(2s22p2P1/2) for the ranges of electron and neutral hydrogen densities (ne= 10-3 - 103cm-3; nH= 0 - 1000 cm-3) applicable to H I and H II regions. These are found to differ significantly from the earlier calculations of Smeding & Pottasch, and lead to electron density estimates between 40 and 60 per cent smaller.

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