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New Collisional Ionization Equilibrium Calculations for Optically Thin Plasmas

Savin, Daniel Wolf; Bryans, P.; Mitthumsiri, W.; Grieser, M.; Badnell, N. R.; Gorczyca, T. W.; Laming, J. M.

Reliably interpreting spectra from electron-ionized laboratory and cosmic plasmas requires accurate ionization balance calculations for the plasma in question. However, much of the atomic data needed for these calculations have not been generated using modern theoretical methods and their reliability are often highly suspect. We have carried out state-of-the-art calculations of dielectronic recombination (DR) rate coefficients for the hydrogenic through Mg-like ions of all elements from He to Zn as well as for Al- like to Ar-like ions of Fe. We have also carried out state-of-the-art radiative recombination (RR) rate coefficient calculations for the bare through Na-like ions of all elements from H to Zn. Using our data and the most recently recommended electron impact ionization data, we present improved collisional ionization equilibrium (CIE) calculations. Here, as an example, we present our calculated fractional ionic abundances for iron using these data and compare them with those from the previously recommended CIE calculations.

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More About This Work

Academic Units
Astronomy and Astrophysics
Publisher
NASA
Published Here
April 5, 2013
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