The Iron Project: Collisional and Radiative Processes in Iron-Peak Elements

Physics

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The aim of the IRON Project is to study the atomic processes and to calculate data for all Iron ions and iron-group atoms and ions for applications in astrophysical and laboratory plasmas. The main emphasis is on collisional and radiative processes, such as electron impact excitation, photoionization, and other radiative transitions using the R-matrix method in the close coupling approximation. Computer codes developed under the Opacity Project are extended for this purpose including the relativistic Breit-Pauli extension in order to enable fine-structure calculations. In addition, at Ohio state, a fully-relativistic distorted-wave method for high-energy photoionization have been developed. In this report we will present some recent results for Fe I, Fe II, Fe III, Fe IV, Fe XXII and Fe XXV, as well as for Ni II. Also, at Ohio State, a parallelized version of the R-matrix codes has been developed for the massively parallel machine Cray T3D. The work is supported partially by the U.S. National Science Foundation (PHY-9421898), NASA LTSA program (NAGW-3315) and NASA ADP program (NAS5-32643).

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