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

Schmidt, E. W. and Schippers, S. and Bernhardt, D. and Müller, A. and Hoffmann, J. and Lestinsky, M. and Orlov, D. A. and Wolf, A. and Lukic, D. V. and Savin, D. W. and Badnell, N. R. (2008) Electron-ion recombination for Fe VIII forming Fe VII and Fe IX forming Fe VIII : measurements and theory. Astronomy and Astrophysics, 492 (1). pp. 265-275. ISSN 0004-6361 (https://doi.org/10.1051/0004-6361:200810834)

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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.

  • Item type:Article
    ID code:26764
    Dates:
    Date
    Event
    2 December 2008
    Published
    Subjects:Science > Physics
    Science > Astronomy
    Department:Faculty of Science > Physics
    Depositing user:Users 1261 not found.
    Date deposited:17 Aug 2010 08:39
    Last modified:08 Apr 2024 18:18
    URI:https://strathprints.strath.ac.uk/id/eprint/26764
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