New atomic data for Si/6+/, S/8+/ and Ar/10+/

Details New atomic data for Si/6+/, S/8+/ and Ar/10+/ New atomic data for Si/6+/, S/8+/ and Ar/10+/

Nov 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979a%26a....80...22b&link_type=abstract

Astronomy and Astrophysics, vol. 80, no. 1, Nov. 1979, p. 22-26. NASA-supported research.

Astronomy and Astrophysics

Astrophysics

36

Isoelectronic Sequence, Oxygen Spectra, Solar Corona, Solar Spectra, Electron Density (Concentration), Satellite Observation, Solar Atmosphere, Tables (Data)

Scientific paper

The paper gives new atomic data, populations of excited levels, and line intensity ratios for the ions Si VII, S IX, and Ar XI of the O I isoelectronic sequence. Ten levels are included in the calculations, i.e., the levels of the 2s/2/2p/4/ and 2s2p/5/ and 2p/6/ configurations. It is noted that the calculations are done for applications to solar plasmas. The line ratios (2s/2/2p/4/3P1 - 2s2p/5/3P0) / (2s/2/2p/4/3P1 - 2s2p/5/3P1) and (2s/2/2p/4/1D2 - 2s2p/5/1P/1/) / (2s/2/2p/4/3P/1/ - 2s1p/5/3P/1/) are two of the ratios useful for electron density determination. Finally, density sensitive line ratios of Ca XIII and Fe XIX are also discussed.

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