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#288 new enhancement

DR for Fe12 + forming Fe11+

Reported by: Gary J. Ferland Owned by: nobody
Priority: good to do Milestone:
Component: atomic/molecular data base Version: trunk
Keywords: Cc:

Description

Title:	
Electron-Ion Recombination of Fe12 + Forming Fe11 +: Laboratory Measurements and Theoretical Calculations
Authors:	
Hahn, M.; Badnell, N. R.; Grieser, M.; Krantz, C.; Lestinsky, M.; Müller, A.; Novotný, O.; Repnow, R.; Schippers, S.; Wolf, A.; Savin, D. W.
Affiliation:	
AA(Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027, USA), AB(Department of Physics, University of Strathclyde, 107 Rottenrow East, Glasgow G4 0NG, UK), AC(Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany), AD(Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany), AE(GSI Helmholtzzentrum für Schwerionenforschung, Planckstrasse 1, D-64291 Darmstadt, Germany), AF(Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Giessen, Leihgesterner Weg 217, D-35392 Giessen, Germany), AG(Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027, USA), AH(Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany), AI(Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Giessen, Leihgesterner Weg 217, D-35392 Giessen, Germany), AJ(Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, D-69117 Heidelberg, Germany), AK(Columbia Astrophysics Laboratory, Columbia University, 550 West 120th Street, New York, NY 10027, USA)
Publication:	
The Astrophysical Journal, Volume 788, Issue 1, article id. 46, 7 pp. (2014). (ApJ Homepage)
Publication Date:	
06/2014
Origin:	
IOP
Astronomy Keywords:	
atomic data, atomic processes, galaxies: active, galaxies: nuclei, plasmas, X-rays: galaxies
DOI:	
10.1088/0004-637X/788/1/46
Bibliographic Code:	
2014ApJ...788...46H
Abstract

We have measured dielectronic recombination (DR) for Fe12 + forming Fe11 + 
using the heavy ion storage ring TSR located at the Max Planck Institute for Nuclear 
Physics in Heidelberg, Germany. Using our results, we have calculated a plasma rate 
coefficient from these data that can be used for modeling astrophysical and 
laboratory plasmas. For the low temperatures characteristic of photoionized 
plasmas, the experimentally derived rate coefficient is orders of magnitude larger 
than the previously recommended atomic data. The existing atomic data were also 
about 40% smaller than our measurements at temperatures relevant for collisionally 
ionized plasmas. Recent state-of-the-art theory has difficulty reproducing the 
detailed energy dependence of the DR spectrum. However, for the Maxwellian 
plasma rate coefficient, recent theoretical results agree with our measurements to 
within about 30% for both photoionized and collisionally ionized plasmas.
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