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High-accuracy measurements of core-excited transitions in light Li-like ions

The transition energies of the two 1⁢𝑠 core-excited soft x-ray lines (dubbed 𝑞 and 𝑟) from 1⁢𝑠2⁢2⁢𝑠⁢1⁢𝑆1/2 to the respective upper levels 1⁢𝑠⁢(2𝑆)⁢2⁢𝑠⁢2⁢𝑝⁢(3𝑃)⁢2⁢𝑃3/2 and 2⁢𝑃1/2 of Li-like oxygen, fluorine, and neon were measured and calibrated using several nearby transitions of He-like ions. The m...

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Main Authors: Togawa, Moto (Author) , Kühn, Steffen (Author) , Shah, Chintan (Author) , Zaytsev, Vladimir A. (Author) , Oreshkina, Natalia S. (Author) , Buck, Jens (Author) , Bernitt, Sonja (Author) , Steinbrügge, René (Author) , Seltmann, Jörn (Author) , Hoesch, Moritz (Author) , Keitel, Christoph H. (Author) , Pfeifer, Thomas (Author) , Leutenegger, Maurice A. (Author) , Crespo López-Urrutia, José Ramon (Author)
Format: Article (Journal)
Language:English
Published: 4 September, 2024
In: Physical review
Year: 2024, Volume: 110, Issue: 3, Pages: 1-7
ISSN:2469-9934
DOI:10.1103/PhysRevA.110.L030802
Online Access:Verlag, kostenfrei, Volltext: https://doi.org/10.1103/PhysRevA.110.L030802
Verlag, kostenfrei, Volltext: https://link.aps.org/doi/10.1103/PhysRevA.110.L030802
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Author Notes:Moto Togawa, Steffen Kühn, Chintan Shah, Vladimir A. Zaytsev, Natalia S. Oreshkina, Jens Buck, Sonja Bernitt, René Steinbrügge, Jörn Seltmann, Moritz Hoesch, Christoph H. Keitel, Thomas Pfeifer, Maurice A. Leutenegger, and José R. Crespo López-Urrutia
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Summary:The transition energies of the two 1⁢𝑠 core-excited soft x-ray lines (dubbed 𝑞 and 𝑟) from 1⁢𝑠2⁢2⁢𝑠⁢1⁢𝑆1/2 to the respective upper levels 1⁢𝑠⁢(2𝑆)⁢2⁢𝑠⁢2⁢𝑝⁢(3𝑃)⁢2⁢𝑃3/2 and 2⁢𝑃1/2 of Li-like oxygen, fluorine, and neon were measured and calibrated using several nearby transitions of He-like ions. The major remaining source of energy uncertainties in monochromators, the periodic fluctuations produced by imperfect angular encoder calibration, is addressed by a simultaneously running photoelectron spectroscopy measurement. This leads to an improved energy determination of 5 parts per million, showing fair agreement with previous theories as well as with our own, involving a complete treatment of the autoionizing states studied here. Our experimental results translate to an uncertainty of only 1.6 km/s for the oxygen line 𝑞⁢𝑟 blend used to determine the outflow velocities of active galactic nuclei, ten times smaller than previously possible.
Item Description:Gesehen am 10.03.2025
Physical Description:Online Resource
ISSN:2469-9934
DOI:10.1103/PhysRevA.110.L030802

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