High Resolution Photoexcitation Measurements Exacerbate the Long-Standing Fe XVII Oscillator Strength Problem
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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2019
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| author | Kühn, Steffen Shah, Chintan López-Urrutia, José R. Crespo Fujii, Keisuke Steinbrügge, René Stierhof, Jakob Togawa, Moto Harman, Zoltán Oreshkina, Natalia S. Cheung, Charles Kozlov, Mikhail G. Porsev, Sergey G. Safronova, Marianna S. Berengut, Julian C. Rosner, Michael Bissinger, Matthias Ballhausen, Ralf Hell, Natalie Park, SungNam Chung, Moses Hoesch, Moritz Seltmann, Jörn Surzhykov, Andrey S. Yerokhin, Vladimir A. Wilms, Jörn Porter, F. Scott Stöhlker, Thomas Keitel, Christoph H. Pfeifer, Thomas Brown, Gregory V. Leutenegger, Maurice A. Bernitt, Sven |
| author_facet | Kühn, Steffen Shah, Chintan López-Urrutia, José R. Crespo Fujii, Keisuke Steinbrügge, René Stierhof, Jakob Togawa, Moto Harman, Zoltán Oreshkina, Natalia S. Cheung, Charles Kozlov, Mikhail G. Porsev, Sergey G. Safronova, Marianna S. Berengut, Julian C. Rosner, Michael Bissinger, Matthias Ballhausen, Ralf Hell, Natalie Park, SungNam Chung, Moses Hoesch, Moritz Seltmann, Jörn Surzhykov, Andrey S. Yerokhin, Vladimir A. Wilms, Jörn Porter, F. Scott Stöhlker, Thomas Keitel, Christoph H. Pfeifer, Thomas Brown, Gregory V. Leutenegger, Maurice A. Bernitt, Sven |
| contents | For more than 40 years, most astrophysical observations and laboratory studies of two key soft x-ray diagnostic $2p-3d$ transitions, $3C$ and $3D$, in Fe XVII ions found oscillator strength ratios $f(3C)/f(3D)$ disagreeing with theory, but uncertainties had precluded definitive statements on this much studied conundrum. Here, we resonantly excite these lines using synchrotron radiation at PETRA III, and reach, at a millionfold lower photon intensities, a 10 times higher spectral resolution, and 3 times smaller uncertainty than earlier work. Our final result of $f(3C)/f(3D) = 3.09(8)(6)$ supports many of the earlier clean astrophysical and laboratory observations, while departing by five sigmas from our own newest large-scale ab initio calculations, and excluding all proposed explanations, including those invoking nonlinear effects and population transfers. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_1911_09707 |
| institution | arXiv |
| publishDate | 2019 |
| record_format | arxiv |
| spellingShingle | High Resolution Photoexcitation Measurements Exacerbate the Long-Standing Fe XVII Oscillator Strength Problem Kühn, Steffen Shah, Chintan López-Urrutia, José R. Crespo Fujii, Keisuke Steinbrügge, René Stierhof, Jakob Togawa, Moto Harman, Zoltán Oreshkina, Natalia S. Cheung, Charles Kozlov, Mikhail G. Porsev, Sergey G. Safronova, Marianna S. Berengut, Julian C. Rosner, Michael Bissinger, Matthias Ballhausen, Ralf Hell, Natalie Park, SungNam Chung, Moses Hoesch, Moritz Seltmann, Jörn Surzhykov, Andrey S. Yerokhin, Vladimir A. Wilms, Jörn Porter, F. Scott Stöhlker, Thomas Keitel, Christoph H. Pfeifer, Thomas Brown, Gregory V. Leutenegger, Maurice A. Bernitt, Sven Atomic Physics High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics Solar and Stellar Astrophysics Plasma Physics For more than 40 years, most astrophysical observations and laboratory studies of two key soft x-ray diagnostic $2p-3d$ transitions, $3C$ and $3D$, in Fe XVII ions found oscillator strength ratios $f(3C)/f(3D)$ disagreeing with theory, but uncertainties had precluded definitive statements on this much studied conundrum. Here, we resonantly excite these lines using synchrotron radiation at PETRA III, and reach, at a millionfold lower photon intensities, a 10 times higher spectral resolution, and 3 times smaller uncertainty than earlier work. Our final result of $f(3C)/f(3D) = 3.09(8)(6)$ supports many of the earlier clean astrophysical and laboratory observations, while departing by five sigmas from our own newest large-scale ab initio calculations, and excluding all proposed explanations, including those invoking nonlinear effects and population transfers. |
| title | High Resolution Photoexcitation Measurements Exacerbate the Long-Standing Fe XVII Oscillator Strength Problem |
| topic | Atomic Physics High Energy Astrophysical Phenomena Instrumentation and Methods for Astrophysics Solar and Stellar Astrophysics Plasma Physics |
| url | https://arxiv.org/abs/1911.09707 |