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Session 51 - Interstellar Medium II.
Display session, Thursday, January 08
Exhibit Hall,

[51.18] The Iron Project at Ohio State: collisional and radiative atomic data

A. K. Pradhan, S. N. Nahar, P. Romano, H. L. Zhag (Ohio State Univ.), M. A. Bautista (NASA/ GSFC)

We report the latest results of the Ohio State atomic astrophysics group within the Iron Project. The Iron Project is devoted to the study of radiative and collisional atomic processes primarily for the iron-group elements for applications in astrophysical and laboratory plasmas. Among the processes of particular interest are: electron impact excitation, photoionization, and electron-ion recombination. For this purpose, the computer codes for atomic calculations using the R-matrix method developed under the Opacity Project were extended to include relativistic effects in the Breit-Pauli approximation. The codes were also adapted to run on a variety of computational platforms including massively parallel processors, the Cray T3D/E and the IBM SP2. We report some recent results by our group on collision strengths, radiative transition probabilities, photoionization cross sections, and unified electron-ion recombination rates for ions, Fe I-V, XXII, and all ions of Carbon, Nitrogen, and Oxygen. We report new averaged photoionization cross sections from the Opacity Project for use in astrophysical modeling codes.

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