Electron-ion recombination for Fe VIII forming Fe VII and Fe IX forming Fe VIII: measurements and theory

E. W. Schmidt, S. Schippers, D. Bernhardt, A. Müller, J. Hoffmann, M. Lestinsky, D. A. Orlov, A. Wolf, D. V. Lukic, D. W. Savin, N. R. Badnell

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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 k(B)T = 0.2 to 1000 eV. Their uncertainties amount to < +/- 26% and < +/- 35% at a 90% confidence level for Fe VIII and Fe IX, respectively.

Original languageEnglish
Pages (from-to)265-275
Number of pages11
JournalAstronomy and Astrophysics
Volume492
Issue number1
DOIs
Publication statusPublished - 2 Dec 2008

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Keywords

  • atomic data
  • atomic processes
  • plasmas
  • galaxies: active
  • galaxies: nuclei
  • X-rays: galaxies
  • active galactic nuclei
  • x-ray absorption
  • high-resolution measurement
  • finite-density plasmas
  • dielectronic recombination
  • rate coefficients
  • ionized-gas
  • xmm-newton
  • theoretical calculations
  • laboratory measurements

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