High Resolution Photoexcitation Measurements Exacerbate the Long-Standing Fe XVII Oscillator Strength Problem

Kuehn S, Shah C, Lopez-Urrutia JRC, Fujii K, Steinbruegge R, Stierhof J, Togawa M, Harman Z, Oreshkina NS, Cheung C, Kozlov MG, Porsev SG, Safronova MS, Berengut JC, Rosner M, Bissinger M, Ballhausen R, Hell N, Park S, Chung M, Hoesch M, Seltmann J, Surzhykov AS, Yerokhin VA, Wilms J, Porter FS, Stoehlker T, Keitel CH, Pfeifer T, Brown G, Leutenegger MA, Bernitt S (2020)

Publication Type: Journal article

Publication year: 2020

Journal

Book Volume: 124

Article Number: 225001

Journal Issue: 22

DOI: 10.1103/PhysRevLett.124.225001

Abstract

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.

Authors with CRIS profile

Involved external institutions

Max-Planck-Institut für Kernphysik (MPIK) / Max Planck Institute for Nuclear Physics Germany (DE) Kyoto University / 京都大学 Kyōto daigaku Japan (JP) Deutsches Elektronen-Synchrotron DESY Germany (DE) University of Delaware (UDEL) United States (USA) (US) National Research Centre "Kurchatov Institute" / Hациональный исследовательский центр "Курчатовский Институт" Russian Federation (RU) Lawrence Livermore National Laboratory United States (USA) (US) Ulsan National Institute of Science and Technology (UNIST) / 울산과학기술원 Korea, Republic of (KR) Physikalisch-Technische Bundesanstalt (PTB) Germany (DE) Peter the Great St.Petersburg Polytechnic University (SPbPU) Russian Federation (RU) National Aeronautics and Space Administration (NASA) United States (USA) (US) Friedrich-Schiller-Universität Jena Germany (DE)

How to cite

APA:

Kuehn, S., Shah, C., Lopez-Urrutia, J.R.C., Fujii, K., Steinbruegge, R., Stierhof, J.,... Bernitt, S. (2020). High Resolution Photoexcitation Measurements Exacerbate the Long-Standing Fe XVII Oscillator Strength Problem. Physical Review Letters, 124(22). https://dx.doi.org/10.1103/PhysRevLett.124.225001

MLA:

Kuehn, Steffen, et al. "High Resolution Photoexcitation Measurements Exacerbate the Long-Standing Fe XVII Oscillator Strength Problem." Physical Review Letters 124.22 (2020).

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