Computed N = 2 level populations in helium-like ions from CV to NiXXVII

Details Computed N = 2 level populations in helium-like ions from CV to NiXXVII Computed N = 2 level populations in helium-like ions from CV to NiXXVII

Dec 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975ap%26ss..38..345m&link_type=abstract

(International Astronomical Union, Colloquium on UV and X-ray Spectroscopy of Astrophysical and Laboratory Plasmas, Cambridge, M

Astronomy and Astrophysics

Astronomy

19

Electron Transitions, Plasma Spectra, Population Theory, Quantum Statistics, Forbidden Bands, Line Spectra, Optical Thickness, Spaceborne Astronomy, Spectrum Analysis, X Ray Spectra

Scientific paper

Population densities of all levels with principal quantum number n = 2 in several helium-like ions with Z ranging from 6 to 20 are computed for stationary and transient plasmas as a function of electron temperature, electron density, radiation temperature, dilution factor, and state of ionization. Collisional and radiative coupling of levels of the same multiplicity are calculated as a function of either electron density and temperature or dilution factor and radiation temperature, respectively. Soft X-ray spectral-line fluxes from all possible radiative transitions among the investigated levels are computed for an optically thin plasma, and effects of cascades following collisional excitation of higher levels or radiative and dielectronic recombination are examined. It is shown that inner-shell ionization of a lithium-like ion to form a helium-like ion in a 2(3)S or 2(1)S state can have a strong influence on the forbidden-line intensity in a nonequilibrium plasma. In the case of transient plasmas, it is found that strong departures from a stationary ionization equilibrium can significantly alter the line fluxes.

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