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A&A Supplement series, Vol. 122, April I 1997, 167-176

Received May 21; accepted July 19, 1996

Atomic data from the IRON Project

XX. Photoionization cross sections and oscillator strengths for Fe I

M.A. Bautista

Department of Astronomy, The Ohio State University, 174 West 18th Avenue, Columbus, OH 43210-1106, U.S.A. internet:


Large-scale close coupling calculations for photoionization cross sections and dipole transition probabilities for Fe I are reported. The calculation included 52 LS terms of the target ion Fe II dominated by the configurations tex2html_wrap_inline940, and tex2html_wrap_inline942. The eigenfunction expansion of Fe II accounts for the photoionization of the outer 4s subshell, as well as the open inner 3d subshell, of the ground state tex2html_wrap_inline944 of Fe I. The results include energy levels for 1,117 LS bound states of Fe I, with tex2html_wrap_inline946 and tex2html_wrap_inline948, 32 316 dipole oscillator strengths for transitions among the LS multiplets, and detailed photoionization cross sections, with extensive resonance structures, for all computed bound states. The present photoionization cross section for the ground state is up to three orders of magnitude higher than earlier results from central field type approximations, but it agrees reasonably well with the cross section previously calculated using many-body perturbation theory.

keywords: atomic data -- ultraviolet: general -- infrared: general

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