Breit-Pauli R-Matrix Calculations for L-Shell Atomic Processes in fe XVI, fe XVII, and XVIII

Details Breit-Pauli R-Matrix Calculations for L-Shell Atomic Processes in fe XVI, fe XVII, and XVIII Breit-Pauli R-Matrix Calculations for L-Shell Atomic Processes in fe XVI, fe XVII, and XVIII

May 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aps..dmp.p6088c&link_type=abstract

American Physical Society, 2002 Division of Atomic, Molecular and Optical , abstract #P6.088

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Scientific paper

We report extensive relativistic close coupling R-matrix calculations of L-shell atomic processes in Fe XVI, Fe XVII, and Fe XVIII. In particular these include photoionization, recombination, transition probabilities, and electron impact excitation of Ne-like Fe XVII. The collisional calculations employ employ the Breit-Pauli R-matrix method and a 89-level eigenfunction expansion including up to n = 4 levels of Fe XVII. Significant resonance enhancement of the collision strengths of forbidden and intercombination is demonstrated. The present results differ from all previous calculations, heretofore without detailed resonance structures, and should help resolve longstanding discrepancies. In particular, the present line ratios of three benchmark diagnostic lines 3C, 3D, and 3E at 15.014, 15.265, and 15.456 Årespectively, are in excellent agreement with two independent measurements on Electron-Beam-Ion-Traps [Laming et al., Astrophys. J 545, L161 (2000) and Brown et al., Astrophys. J 502, 1015 (1998)]. The strong energy dependence due to resonances in these and other cross sections is demonstrated. The new theoretical results should be of considerable interest in uc(x-ray) plasma diagnostics of laboratory and astrophysical sources. Relativistic R-matrix calculations for photoionization and recombination of Fe XVI and Fe XVII are in progress. Partial support from the NSF and NASA is acknowledged.

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