Electron-ion recombination of Fe12+ forming Fe11+: laboratory measurements and theoretical calculations

M. Hahn, N. R. Badnell, M. Grieser, C. Krantz, M. Lestinsky, A. Müller, O. Novotný, R. Repnow, S. Schippers, A. Wolf

Research output: Contribution to journalArticle

4 Citations (Scopus)

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.
LanguageEnglish
Number of pages7
JournalAstrophysical Journal
Volume788
Issue number1
Early online date20 May 2014
DOIs
Publication statusPublished - Jun 2014

Fingerprint

electron-ion recombination
recombination
plasma
electron
ion
coefficients
ion storage
nuclear physics
Germany
laboratory
calculation
heavy ions
astrophysics
modeling
energy
rate

Keywords

  • atomic data
  • atomic processes
  • galaxies: active
  • galaxies: nuclei
  • plasmas
  • galaxies x-rays

Cite this

Hahn, M. ; Badnell, N. R. ; Grieser, M. ; Krantz, C. ; Lestinsky, M. ; Müller, A. ; Novotný, O. ; Repnow, R. ; Schippers, S. ; Wolf, A. / Electron-ion recombination of Fe12+ forming Fe11+ : laboratory measurements and theoretical calculations. In: Astrophysical Journal. 2014 ; Vol. 788, No. 1.
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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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Hahn, M, Badnell, NR, Grieser, M, Krantz, C, Lestinsky, M, Müller, A, Novotný, O, Repnow, R, Schippers, S & Wolf, A 2014, 'Electron-ion recombination of Fe12+ forming Fe11+: laboratory measurements and theoretical calculations' Astrophysical Journal, vol. 788, no. 1. https://doi.org/10.1088/0004-637X/788/1/46

Electron-ion recombination of Fe12+ forming Fe11+ : laboratory measurements and theoretical calculations. / Hahn, M.; Badnell, N. R.; Grieser, M.; Krantz, C.; Lestinsky, M.; Müller, A.; Novotný, O.; Repnow, R.; Schippers, S.; Wolf, A.

In: Astrophysical Journal, Vol. 788, No. 1, 06.2014.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Electron-ion recombination of Fe12+ forming Fe11+

T2 - Astrophysical Journal

AU - Hahn, M.

AU - Badnell, N. R.

AU - Grieser, M.

AU - Krantz, C.

AU - Lestinsky, M.

AU - Müller, A.

AU - Novotný, O.

AU - Repnow, R.

AU - Schippers, S.

AU - Wolf, A.

PY - 2014/6

Y1 - 2014/6

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AB - 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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KW - atomic processes

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