The Iron PROJECT/RmaX Network: Atomic Calculations for the Iron-Peak Elements and for X-Ray Spectroscopy

Details The Iron PROJECT/RmaX Network: Atomic Calculations for the Iron-Peak Elements and for X-Ray Spectroscopy The Iron PROJECT/RmaX Network: Atomic Calculations for the Iron-Peak Elements and for X-Ray Spectroscopy

May 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001aps..dmp.m5025c&link_type=abstract

American Physical Society, DAMOP Meeting, May 16-19, 2001 London, Ontario, Canada Bulletin of the American Physical Society, Vol

Astronomy and Astrophysics

Astrophysics

Scientific paper

We report the latest results from the Iron Project (IP) obtained by the Ohio State Atomic Astrophysics group. The IP 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 RmaX network is a part of IP focused on inner-shell transitions and X-ray spectroscopy. 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-Pauli 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 XVII, Fe XXIV, Fe XXV, and Ni II. For example, extensive and dense resonance structures are found in electron excitation collision strengths for Ne-like Fe XVII that differ considerably from those in the Distorted Wave approximation, and should significantly affect X-ray plasma diagnostics. (Partial support from the NSF and NASA is acknowledged.)

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