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

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.

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Item Permalink: https://hdl.handle.net/21.11116/0000-0005-5A91-2 Version Permalink: https://hdl.handle.net/21.11116/0000-0005-5A92-1
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 Creators:
Kühn, Steffen1, Author
Shah, Chintan, Author
Crespo Lopez-Urrutia, José R.2, Author           
Fujii, Keisuke, Author
Steinbrügge, René, Author
Stierhof, Jakob, Author
Togawa, Moto, Author
Harman, Zoltán, Author
Oreshkina, Natalia S., Author
Cheung, Charles, Author
Kozlov, Mikhail G., Author
Porsev, Sergey G., Author
Safronova, Marianna S., Author
Berengut, Julian C., Author
Rosner, Michael, Author
Bissinger, Matthias, Author
Ballhausen, Ralf, Author
Hell, Natalie, Author
Park, SungNam, Author
Chung, Moses, Author
Hoesch, Moritz, AuthorSeltmann, Jörn, AuthorSurzhykov, Andrey S., AuthorYerokhin, Vladimir A., AuthorWilms, Jörn, AuthorPorter, F. Scott, AuthorStöhlker, Thomas, AuthorKeitel, Christoph H., AuthorPfeifer, Thomas2, Author           Brown, Gregory V., AuthorLeutenegger, Maurice A., AuthorBernitt, Sven, Author more..
Affiliations:
1Max-Planck-Institut für Kernphysik, Heidelberg, Germany Heidelberg Graduate School of Fundamental Physics, Ruprecht-Karls-Universität Heidelberg, Heidelberg, Germany, ou_persistent22              
2Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society, ou_2025284              

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Free keywords: Physics, Atomic Physics, physics.atom-ph, Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE, Astrophysics, Instrumentation and Methods for Astrophysics, astro-ph.IM, Astrophysics, Solar and Stellar Astrophysics, astro-ph.SR, Physics, Plasma Physics, physics.plasm-ph
 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.

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 Dates: 2019
 Publication Status: Published online
 Pages: Main text (6 pages, 3 figures), Supplmentary Material (7 pages, 3 figure), submitted to PRL
 Publishing info: -
 Table of Contents: -
 Rev. Type: -
 Identifiers: arXiv: 1911.09707
URI: http://arxiv.org/abs/1911.09707
 Degree: -

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