An unexpectedly low oscillator strength as the origin of the Fe xvii emission problem

S. Bernitt (), G. V. Brown, J. K. Rudolph, R. Steinbrügge, A. Graf, M. Leutenegger, S. W. Epp, S. Eberle, K. Kubiček, V. Mäckel, M. C. Simon, E. Träbert, E. W. Magee, C. Beilmann, N. Hell, S. Schippers, A. Müller, S. M. Kahn, A. Surzhykov, Z. Harman, C. H. Keitel, J. Clementson, F. S. Porter, W. Schlotter, J. J. Turner, J. Ullrich, P. Beiersdorfer and J. R. Crespo López-Urrutia
Additional contact information
S. Bernitt: Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
G. V. Brown: Lawrence Livermore National Laboratory
J. K. Rudolph: Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
R. Steinbrügge: Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
A. Graf: Lawrence Livermore National Laboratory
M. Leutenegger: NASA/Goddard Space Flight Center
S. W. Epp: Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
S. Eberle: Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
K. Kubiček: Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
V. Mäckel: Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
M. C. Simon: TRIUMF, Vancouver, British Columbia V6T 2A3, Canada
E. Träbert: Lawrence Livermore National Laboratory
E. W. Magee: Lawrence Livermore National Laboratory
C. Beilmann: Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
N. Hell: Lawrence Livermore National Laboratory
S. Schippers: Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Gießen, 35392 Gießen, Germany
A. Müller: Institut für Atom- und Molekülphysik, Justus-Liebig-Universität Gießen, 35392 Gießen, Germany
S. M. Kahn: Kavli Institute for Particle Astrophysics and Cosmology, SLAC National Accelerator Laboratory
A. Surzhykov: Physikalisches Institut, Ruprecht-Karls-Universität Heidelberg, 69120 Heidelberg, Germany
Z. Harman: Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
C. H. Keitel: Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
J. Clementson: Lawrence Livermore National Laboratory
F. S. Porter: NASA/Goddard Space Flight Center
W. Schlotter: Linac Coherent Light Source, SLAC National Accelerator Laboratory
J. J. Turner: Linac Coherent Light Source, SLAC National Accelerator Laboratory
J. Ullrich: Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany
P. Beiersdorfer: Lawrence Livermore National Laboratory
J. R. Crespo López-Urrutia: Max-Planck-Institut für Kernphysik, 69117 Heidelberg, Germany

Nature, 2012, vol. 492, issue 7428, 225-228

Abstract: Fluorescence of iron ions induced by an X-ray laser allows the relative oscillator strength for Fe xvii emission to be determined; it is found to differ by 3.6σ from the best quantum mechanical calculations, suggesting that the poor agreement between prediction and observations of the brightest Fe xvii line is rooted in the quality of the underlying atomic wavefunctions used in the models.

Date: 2012
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DOI: 10.1038/nature11627

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