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          Institute: MPI für Kernphysik     Collection: Spectroscopy and Dynamics of Trapped and Stored Ions     Display Documents

ID: 280987.0, MPI für Kernphysik / Spectroscopy and Dynamics of Trapped and Stored Ions
Dielectronic Recombination of Fe XXIII Forming Fe XXII: Laboratory Measurements and Theoretical Calculations
Authors:Savin, D.; Gwinner, G.; Grieser, M.; Repnow, R.; Schnell, M.; Schwalm, D.; Wolf, A.; Zhou, S.G.; Kieslich, S.; Mueller, A.; Schippers, S.; Colgan, J.; Loch, S.; Badnell, N.; Chen, M.; Gu, M.
Date of Publication (YYYY-MM-DD):2006-05
Title of Journal:The Astrophysical Journal
Issue / Number:2
Start Page:1275
End Page:1285
Copyright:© 2006. The American Astronomical Society. All rights reserved. Printed in U.S.A.
Review Status:Peer-review
Audience:Experts Only
Intended Educational Use:No
Abstract / Description:We have measured resonance strengths and energies for dielectronic recombination (DR) of beryllium-like Fe XXIII forming boron-like Fe XXII via N = 2 → N′ = 2 and N = 2 → N′ = 3 core excitations. All measurements were carried out using the heavy-ion Test Storage Ring at the Max Planck Institute for Nuclear Physics (MPI-K) in Heidelberg, Germany. We have also calculated these resonance strengths and energies using three independent, perturbative, state-of-the-art theoretical techniques: the multiconfiguration Breit-Pauli (MCBP) method, the multiconfiguration Dirac-Fock (MCDF) method, and the Flexible Atomic Code (FAC). Overall reasonable agreement is found between our experimental results and these theoretical calculations. We have used our measurements to produce a Maxwellian-averaged DR rate coefficient for Fe XXIII. Our experimentally derived rate coefficient is estimated to be accurate to better that ≈20%. At temperatures where Fe XXIII is predicted to form in both photoionized and electron-ionized gas, we find mixed agreement between our experimental rate coefficient and previously published rate coefficients. We find good agreement at these temperatures between the experimentally derived rate coefficient and our MCBP, MCDF, and FAC results.
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group of D. Zajfman/Atomic and Molecular Physics with Stored Ions (A. Wolf)
External Affiliations:Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, Mail Code 5247, New York, NY 10027;
Institut für Atom- und Molekülphysik, Justus-Liebig-Universität, D-35392 Giessen, Germany
Los Alamos National Laboratory, P.O. Box 1663, Los Alamos, NM 87545
Physics Department, Auburn University, 206 Allison Laboratory, Auburn, AL 36849
Department of Physics, University of Strathclyde, Glasgow G4 0NG, UK
Lawrence Livermore National Laboratory, P.O. Box 808, Livermore, CA 94551
Department of Physics and Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, 382 Via Pueblo Mall, Stanford, CA 94305
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