On the systematics of line ratios along the helium isoelectronic sequence

Details On the systematics of line ratios along the helium isoelectronic sequence On the systematics of line ratios along the helium isoelectronic sequence

Dec 1982

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1982apj...263..477p&link_type=abstract

Astrophysical Journal, Part 1, vol. 263, Dec. 1, 1982, p. 477-482. Research supported by the Natural Sciences and Engineering R

Physics

Plasma Physics

79

Electron Transitions, Helium Ions, Isoelectronic Sequence, Line Spectra, Plasma Physics, Calcium, Carbon, Forbidden Transitions, Iron, Oxygen Ions, Resonance Lines, Silicon, Sulfur, Temperature Dependence

Scientific paper

Temperature and change dependence of the line ratios involving the forbidden, intercombination, and the resonance lines is investigated for helium-like ions of C, O, Ne, Si, S, Ca, and Fe. Systematic variations are found and should facilitate the interpretation of observed data. Calculations are carried out using more accurate atomic data than earlier works resulting in significant differences. A few recent observations from laboratory and astrophysical plasmas are discussed.

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