Heliumlike ion line intensities. I - Stationary plasmas. II - Non-stationary plasmas

Astronomy and Astrophysics – Astrophysics

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Atomic Energy Levels, Helium Ions, Plasma Spectra, Solar Spectra, X Ray Spectroscopy, Forbidden Bands, Ion Recombination, Iron, Photosphere, Rates (Per Time), Silicon, Transition Probabilities

Scientific paper

Consideration is given to heliumlike ion line intensities for both stationary and nonstationary plasmas. For stationary plasmas the population densities of all levels having principal quantum number two in heliumlike ions (CV to Ni XXVII) are studied. Attention is given to several excitation mechanisms and de-excitation mechanisms. For nonstationary plasmas the ratios of forbidden intercombination line intensities and forbidden plus intercombination to resonance line intensities are studied for models representing solar flares. The effects of processes populating the upper line levels are discussed, such as direct collisional excitation of higher levels, radiative recombination, and dielectronic recombination. Results are presented for silicon and iron ions. The study is also applicable to hot transient laboratory plasmas.

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