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

doi:10.48550/arxiv.1911.09707

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Spectrum Of Fe XVII2

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2022

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“…In our present calculation, the size of the space P + Q S is about 1.4 million determinants, and the size of the space P + Q S is close to 2 million determinants, which is significantly less than the CI space of Ref. [34].…”

Section: Spectrum Of Fe XVIImentioning

confidence: 54%

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Combination of the Perturbation Theory with Configuration Interaction Method

Kozlov¹,

Tupitsyn²,

Bondarev³

et al. 2022

Preprint

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Present atomic theory provides accurate and reliable results for atoms with a small number of valence electrons. However, most current methods of calculations fail when the number of valence electrons exceeds four or five. This means that we can not make reliable predictions for more than a half of the periodic table . Here we suggest a modification of the CI+MBPT (configuration interaction plus many-body perturbation theory) method, which may be applicable to atoms and ions with filling d and f shells.

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Section: Spectrum Of Fe XVIImentioning

confidence: 54%

“…Ten-electron ion Fe XVII plays an important role in astrophysics and plasma physics, see Ref. [34] and references therein. The spectrum of this ion was calculated within several different approaches [35] with relative accuracy of about 0.03%.…”

Section: Spectrum Of Fe XVIImentioning

confidence: 99%