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Journal Article PUBDB-2020-05089
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High Resolution Photoexcitation Measurements Exacerbate the Long-Standing Fe XVII Oscillator Strength Problem

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2020
APS College Park, Md.

Physical review letters 124(22), 225001 (1-7) () [10.1103/PhysRevLett.124.225001]
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Report No.: arXiv:1911.09707

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.

Keyword(s): Plasma and Beam Physics

Classification:

Note: Phys. Rev. Lett. 124, 225001 (2020). Main text (6 pages, 3 figures), Supplmentary Material (8 pages, 4 figure), Published in Physical Review Letters
Contributing Institute(s):
  1. DOOR-User (DOOR ; HAS-User)
  2. Experimentebetreuung PETRA III (FS-PET-S)
Research Program(s):
  1. 6G3 - PETRA III (POF3-622) (POF3-622)
  2. FS-Proposal: I-20180534 (I-20180534) (I-20180534)
Experiment(s):
  1. PETRA Beamline P04 (PETRA III)

Appears in the scientific report 2020
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High-resolution Photo-excitation Measurements Exacerbate the Long-standing Fe XVII Emission Problem
[10.3204/PUBDB-2019-05599]  GO OpenAccess  Download fulltext Files  Download fulltextFulltext Download fulltextFulltext by arXiv.org BibTeX | EndNote: XML, Text | RIS

 Record created 2020-12-17, last modified 2025-07-16
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