Dielectronic recombination of Fe XXIII forming Fe XXII: Laboratory measurements and theoretical calculations

D.W. Savin, G. Gwinner, M. Grieser, R. Repnow, M. Schnell, D. Schwalm, A. Wolf, S.G. Zhou, S. Kieslich, A. Muller, S. Schippers, J. Colgan, S.D. Loch, N.R. Badnell, M.H. Chen, M.F. Gu

Research output: Contribution to journalArticle

42 Citations (Scopus)

Abstract

We have measured resonance strengths and energies for dielectronic recombination (DR) of beryllium-like Fe XXIII forming boron-like Fe XXII via N = 2 -> N' = 2 and N = 2 -> N' = 3 core excitations. All measurements were carried out using the heavy-ion Test Storage Ring at the Max Planck Institute for Nuclear Physics (MPI-K) in Heidelberg, Germany. We have also calculated these resonance strengths and energies using three independent, perturbative, state-of-the-art theoretical techniques: the multiconfiguration Breit-Pauli (MCBP) method, the multiconfiguration Dirac-Fock (MCDF) method, and the Flexible Atomic Code (FAC). Overall reasonable agreement is found between our experimental results and these theoretical calculations. We have used our measurements to produce a Maxwellian-averaged DR rate coefficient for Fe XXIII. Our experimentally derived rate coefficient is estimated to be accurate to better that approximate to 20%. At temperatures where Fe XXIII is predicted to form in both photo-ionized and electron-ionized gas, we find mixed agreement between our experimental rate coefficient and previously published rate coefficients. We find good agreement at these temperatures between the experimentally derived rate coefficient and our MCBP, MCDF, and FAC results.

LanguageEnglish
Pages1275-1285
Number of pages11
JournalAstrophysical Journal
Volume642
Issue number2
DOIs
Publication statusPublished - 10 May 2006

Fingerprint

recombination
coefficients
beryllium
ionized gases
nuclear physics
Germany
boron
energy
heavy ions
temperature
laboratory
rate
calculation
electron
ion
gas
excitation
electrons
method
code

Keywords

  • atomic data
  • atomic processes
  • finite density plasmas
  • electron ion recombination
  • high resolution measurement
  • rate coefficients
  • ionization equilibrium
  • isoelectronic sequences
  • BE-like
  • radiative recombination
  • core excitations
  • storage ring

Cite this

Savin, D. W., Gwinner, G., Grieser, M., Repnow, R., Schnell, M., Schwalm, D., ... Gu, M. F. (2006). Dielectronic recombination of Fe XXIII forming Fe XXII: Laboratory measurements and theoretical calculations. Astrophysical Journal, 642(2), 1275-1285. https://doi.org/10.1086/501420
Savin, D.W. ; Gwinner, G. ; Grieser, M. ; Repnow, R. ; Schnell, M. ; Schwalm, D. ; Wolf, A. ; Zhou, S.G. ; Kieslich, S. ; Muller, A. ; Schippers, S. ; Colgan, J. ; Loch, S.D. ; Badnell, N.R. ; Chen, M.H. ; Gu, M.F. . / Dielectronic recombination of Fe XXIII forming Fe XXII : Laboratory measurements and theoretical calculations. In: Astrophysical Journal. 2006 ; Vol. 642, No. 2. pp. 1275-1285.
@article{bf585d8776f54f16a1acc7d7351fa0aa,
title = "Dielectronic recombination of Fe XXIII forming Fe XXII: Laboratory measurements and theoretical calculations",
abstract = "We have measured resonance strengths and energies for dielectronic recombination (DR) of beryllium-like Fe XXIII forming boron-like Fe XXII via N = 2 -> N' = 2 and N = 2 -> N' = 3 core excitations. All measurements were carried out using the heavy-ion Test Storage Ring at the Max Planck Institute for Nuclear Physics (MPI-K) in Heidelberg, Germany. We have also calculated these resonance strengths and energies using three independent, perturbative, state-of-the-art theoretical techniques: the multiconfiguration Breit-Pauli (MCBP) method, the multiconfiguration Dirac-Fock (MCDF) method, and the Flexible Atomic Code (FAC). Overall reasonable agreement is found between our experimental results and these theoretical calculations. We have used our measurements to produce a Maxwellian-averaged DR rate coefficient for Fe XXIII. Our experimentally derived rate coefficient is estimated to be accurate to better that approximate to 20{\%}. At temperatures where Fe XXIII is predicted to form in both photo-ionized and electron-ionized gas, we find mixed agreement between our experimental rate coefficient and previously published rate coefficients. We find good agreement at these temperatures between the experimentally derived rate coefficient and our MCBP, MCDF, and FAC results.",
keywords = "atomic data, atomic processes, finite density plasmas, electron ion recombination, high resolution measurement, rate coefficients, ionization equilibrium, isoelectronic sequences, BE-like, radiative recombination, core excitations, storage ring",
author = "D.W. Savin and G. Gwinner and M. Grieser and R. Repnow and M. Schnell and D. Schwalm and A. Wolf and S.G. Zhou and S. Kieslich and A. Muller and S. Schippers and J. Colgan and S.D. Loch and N.R. Badnell and M.H. Chen and M.F. Gu",
year = "2006",
month = "5",
day = "10",
doi = "10.1086/501420",
language = "English",
volume = "642",
pages = "1275--1285",
journal = "Astrophysical Journal",
issn = "0004-637X",
number = "2",

}

Savin, DW, Gwinner, G, Grieser, M, Repnow, R, Schnell, M, Schwalm, D, Wolf, A, Zhou, SG, Kieslich, S, Muller, A, Schippers, S, Colgan, J, Loch, SD, Badnell, NR, Chen, MH & Gu, MF 2006, 'Dielectronic recombination of Fe XXIII forming Fe XXII: Laboratory measurements and theoretical calculations' Astrophysical Journal, vol. 642, no. 2, pp. 1275-1285. https://doi.org/10.1086/501420

Dielectronic recombination of Fe XXIII forming Fe XXII : Laboratory measurements and theoretical calculations. / Savin, D.W. ; Gwinner, G.; Grieser, M.; Repnow, R.; Schnell, M.; Schwalm, D.; Wolf, A.; Zhou, S.G. ; Kieslich, S.; Muller, A.; Schippers, S.; Colgan, J.; Loch, S.D.; Badnell, N.R. ; Chen, M.H. ; Gu, M.F. .

In: Astrophysical Journal, Vol. 642, No. 2, 10.05.2006, p. 1275-1285.

Research output: Contribution to journalArticle

TY - JOUR

T1 - Dielectronic recombination of Fe XXIII forming Fe XXII

T2 - Astrophysical Journal

AU - Savin, D.W.

AU - Gwinner, G.

AU - Grieser, M.

AU - Repnow, R.

AU - Schnell, M.

AU - Schwalm, D.

AU - Wolf, A.

AU - Zhou, S.G.

AU - Kieslich, S.

AU - Muller, A.

AU - Schippers, S.

AU - Colgan, J.

AU - Loch, S.D.

AU - Badnell, N.R.

AU - Chen, M.H.

AU - Gu, M.F.

PY - 2006/5/10

Y1 - 2006/5/10

N2 - We have measured resonance strengths and energies for dielectronic recombination (DR) of beryllium-like Fe XXIII forming boron-like Fe XXII via N = 2 -> N' = 2 and N = 2 -> N' = 3 core excitations. All measurements were carried out using the heavy-ion Test Storage Ring at the Max Planck Institute for Nuclear Physics (MPI-K) in Heidelberg, Germany. We have also calculated these resonance strengths and energies using three independent, perturbative, state-of-the-art theoretical techniques: the multiconfiguration Breit-Pauli (MCBP) method, the multiconfiguration Dirac-Fock (MCDF) method, and the Flexible Atomic Code (FAC). Overall reasonable agreement is found between our experimental results and these theoretical calculations. We have used our measurements to produce a Maxwellian-averaged DR rate coefficient for Fe XXIII. Our experimentally derived rate coefficient is estimated to be accurate to better that approximate to 20%. At temperatures where Fe XXIII is predicted to form in both photo-ionized and electron-ionized gas, we find mixed agreement between our experimental rate coefficient and previously published rate coefficients. We find good agreement at these temperatures between the experimentally derived rate coefficient and our MCBP, MCDF, and FAC results.

AB - We have measured resonance strengths and energies for dielectronic recombination (DR) of beryllium-like Fe XXIII forming boron-like Fe XXII via N = 2 -> N' = 2 and N = 2 -> N' = 3 core excitations. All measurements were carried out using the heavy-ion Test Storage Ring at the Max Planck Institute for Nuclear Physics (MPI-K) in Heidelberg, Germany. We have also calculated these resonance strengths and energies using three independent, perturbative, state-of-the-art theoretical techniques: the multiconfiguration Breit-Pauli (MCBP) method, the multiconfiguration Dirac-Fock (MCDF) method, and the Flexible Atomic Code (FAC). Overall reasonable agreement is found between our experimental results and these theoretical calculations. We have used our measurements to produce a Maxwellian-averaged DR rate coefficient for Fe XXIII. Our experimentally derived rate coefficient is estimated to be accurate to better that approximate to 20%. At temperatures where Fe XXIII is predicted to form in both photo-ionized and electron-ionized gas, we find mixed agreement between our experimental rate coefficient and previously published rate coefficients. We find good agreement at these temperatures between the experimentally derived rate coefficient and our MCBP, MCDF, and FAC results.

KW - atomic data

KW - atomic processes

KW - finite density plasmas

KW - electron ion recombination

KW - high resolution measurement

KW - rate coefficients

KW - ionization equilibrium

KW - isoelectronic sequences

KW - BE-like

KW - radiative recombination

KW - core excitations

KW - storage ring

U2 - 10.1086/501420

DO - 10.1086/501420

M3 - Article

VL - 642

SP - 1275

EP - 1285

JO - Astrophysical Journal

JF - Astrophysical Journal

SN - 0004-637X

IS - 2

ER -