Journal article

Publication year: 2006

Pages: 1275-1285

Journal: The Astrophysical Journal

Volume number: 642

Issue number: 2

ISSN: 0004-637X

eISSN: 1538-4357

Open access status: Green

DOI Link: https://doi.org/10.1086/501420

Publisher: American Astronomical Society

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.

Harvard Citation style: Savin, D., Gwinner, G., Grieser, M., Repnow, R., Schnell, M., Schwalm, D., et al. (2006) Dielectronic recombination of Fe XXIII forming Fe XXII: Laboratory measurements and theoretical calculations, The Astrophysical Journal, 642(2), pp. 1275-1285. https://doi.org/10.1086/501420

APA Citation style: Savin, D., Gwinner, G., Grieser, M., Repnow, R., Schnell, M., Schwalm, D., Wolf, A., Zhou, S., Kieslich, S., Müller, A., Schippers, S., Colgan, J., Loch, S., Badnell, N., Chen, M., & Gu, M. (2006). Dielectronic recombination of Fe XXIII forming Fe XXII: Laboratory measurements and theoretical calculations. The Astrophysical Journal. 642(2), 1275-1285. https://doi.org/10.1086/501420