Atomic Calculations from the Iron Project

Astronomy and Astrophysics – Astrophysics

Scientific paper

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Scientific paper

We report the latest results from the Iron Project obtained by the Ohio State atomic astrophysics group. The Iron Project is devoted to the study of collisional and radiative atomic processes primarily for the iron-group elements for various applications in astrophysical and laboratory plasmas. The processes of interest are: electron impact excitation, photoionization, transition probabilities and electron-ion recombination. The large-scale atomic calculations for the heavy atomic systems are carried out with the close coupling R-matrix method, including relativistic effects in the Breit-Paulit approximation. Selected results, and new physical features, are reported from recent work on collision strengths, radiative transition probabilities, photoionization cross sections, and unified electron-ion recombination rates for Fe V, Fe XVII, Fe XXIV, Fe XXV, and Carbon and Oxygen ions. Relevance of the Iron Project work to current and future studies of X-ray plasmas is emphasized. (Partial support from the NSF and NASA are acknowledged.)

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