Astronomy & Astrophysics
A&A 492, 265–275 (2008) DOI: 10.1051/0004-6361:200810834 c ESO 2008
Electron-ion recombination for Fe viii forming Fe vii and Fe ix forming Fe viii: measurements and theory E. W. Schmidt1 , S. Schippers1 , D. Bernhardt1 , A. Müller1 , J. Hoffmann2 , M. Lestinsky2,3 , D. A. Orlov2 , A. Wolf2 , D. V. Luki´c3, , D. W. Savin3 , and N. R. Badnell4 1 2 3 4
Institut für Atom- und Molekülphysik, Justus-Liebig-Universität, Leihgesterner Weg 217, 35392 Giessen, Germany http://www.uni-giessen.de/cms/iamp e-mail:
[email protected] Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany http://www.mpi-hd.mpg.de/ion-storage/ Columbia Astrophysics Laboratory, Columbia University, 550 West 120th, New York, NY 10027, USA http://www.astro.columbia.edu/~savin/ Department of Physics, University of Strathclyde, Glasgow G4 0NG, UK http://amdpp.phys.strath.ac.uk/
Received 20 August 2008 / Accepted 9 October 2008 ABSTRACT
The photorecombination rate coefficients of potassium-like Fe viii ions forming calcium-like Fe vii and of argon-like Fe ix forming potassium-like Fe viii were measured by employing the merged electron-ion beams method at the Heidelberg heavy-ion storagering TSR. New theoretical calculations with the AUTOSTRUCTURE code were carried out for dielectronic recombination (DR) and trielectronic recombination (TR) for both ions. We compare these experimental and theoretical results and also compare with previously recommended rate coefficients. The DR and TR resonances were experimentally investigated in the electron-ion collision energy ranges 0–120 eV and 0–151 eV for Fe viii and Fe ix. Experimentally derived Fe viii and Fe ix DR + TR plasma rate coefficients are provided in the temperature range kB T = 0.2 to 1000 eV. Their uncertainties amount to
