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High-resolution Photo-excitation Measurements Exacerbate the Long-standing Fe XVII Emission Problem

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Crespo Lopez-Urrutia,  José R.
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Pfeifer,  Thomas
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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1911.09707.pdf
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Citation

Kühn, S., Shah, C., Crespo Lopez-Urrutia, J. R., Fujii, K., Steinbrügge, R., Stierhof, J., et al. (2019). High-resolution Photo-excitation Measurements Exacerbate the Long-standing Fe XVII Emission Problem. Retrieved from http://arxiv.org/abs/1911.09707.


Cite as: https://hdl.handle.net/21.11116/0000-0005-5A91-2
Abstract
We measured the L-shell soft X-ray fluorescence of Fe XVII ions in an
electron beam ion trap following resonant photo-excitation using synchrotron
radiation provided by the P04 beamline at PETRA III. Special attention is paid
to two 2p-3d transitions, the 3C and 3D lines that are essential plasma
diagnostics tools for astrophysics. Their resulting oscillator-strength ratio,
f(3C)/f(3D) = 3.09(8)(6), is three times more accurate than previous results.
The present ratio clearly departs by approximately 5-sigmas from the newest ab
initio calculations but confirms previous laboratory measurements and
astrophysical observations. A ten thousand-fold reduction in excitation-photon
intensity and ten times higher spectral resolution allow us to exclude current
explanations, reinstating a forty-year-old atomic-physics puzzle.