2020
DOI: 10.1103/physrevlett.124.225001
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High Resolution Photoexcitation Measurements Exacerbate the Long-Standing Fe XVII Oscillator Strength Problem

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 fð3CÞ=fð3DÞ 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 uncer… Show more

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Cited by 41 publications
(41 citation statements)
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References 70 publications
(119 reference statements)
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“…However, we notice that, in spite of accurate R 1 ratios, the absolute A-values in some datasets are somewhat larger, particularly those for [O II] A( 2 D o 5/2 − 4 S o 3/2 ) recently computed with the MCDF method [42][43][44]. This type of discrepancy can only be resolved by measurement, although we remain skeptical in light of the long-standing discord between theory and experiment regarding the Fe XVII 3C/3D f -value ratio [66].…”
Section: Discussionmentioning
confidence: 82%
“…However, we notice that, in spite of accurate R 1 ratios, the absolute A-values in some datasets are somewhat larger, particularly those for [O II] A( 2 D o 5/2 − 4 S o 3/2 ) recently computed with the MCDF method [42][43][44]. This type of discrepancy can only be resolved by measurement, although we remain skeptical in light of the long-standing discord between theory and experiment regarding the Fe XVII 3C/3D f -value ratio [66].…”
Section: Discussionmentioning
confidence: 82%
“…For the last four decades, there has been a persistent discrepancy between the observed intensity ratios and advanced plasma models, diminishing the utility of high-resolution X-ray observations. A recent experiment measured the most accurate 3C/3D oscillator strength to date, in an attempt to explain this puzzle [35].…”
Section: Calculation Of the 3c/3d Line Intensity Ratio In Fe XVIImentioning
confidence: 99%
“…A particularly interesting example of the problems that can arise owing to the difference between calculations and experiments is that of the ratio between the 3C and 3D components of the fine structure of the (2p 5 3d) → (2p 6 ) transition in Fe XVII. Although these lines are commonly emitted from hot astrophysical bodies, they are poorly fitted by models, as calculations predict a larger ratio for the oscillator strength of these lines than what measurements have shown [15,16]. As more precise measurements are obtained, the difference between the calculated and measured ratio of oscillator strengths persists, making this an ongoing problem in astrophysical spectroscopy.…”
Section: Introductionmentioning
confidence: 98%