High-precision Transition Energy Measurements of Neon-like Fe XVII Ions

Shah, Chintan; Togawa, Moto; Botz, Marc; Danisch, Jonas; Goes, Joschka J.; Bernitt, Sonja; Maxton, Marleen; Köbnick, Kai; Buck, Jens; Seltmann, Jörn; Hoesch, Moritz; Gu, Ming Feng; Porter, F. Scott; Pfeifer, Thomas; Leutenegger, Maurice A.; Cheung, Charles; Safronova, Marianna S.; Crespo López-Urrutia, José R.

doi:10.3847/1538-4357/ad454b

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High-precision Transition Energy Measurements of Neon-like Fe XVII Ions

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Shah, Chintan
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Togawa, Moto
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Botz, Marc
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Danisch, Jonas
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Goes, Joschka J.
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Bernitt, Sonja
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Maxton, Marleen
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Köbnick, Kai
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Pfeifer, Thomas
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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Crespo López-Urrutia, José R.
Division Prof. Dr. Thomas Pfeifer, MPI for Nuclear Physics, Max Planck Society;

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https://iopscience.iop.org/article/10.3847/1538-4357/ad454b/pdf
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Citation

Shah, C., Togawa, M., Botz, M., Danisch, J., Goes, J. J., Bernitt, S., et al. (2024). High-precision Transition Energy Measurements of Neon-like Fe XVII Ions. The Astrophysical Journal, 969 (1): 52. doi:10.3847/1538-4357/ad454b.

Cite as: https://hdl.handle.net/21.11116/0000-000F-7CE2-7

Abstract

We improve by a factor of 4–20 the energy accuracy of the strongest soft X-ray transitions of Fe XVII ions by resonantly exciting them in an electron beam ion trap with a monochromatic beam at the P04 beamline of the PETRA III synchrotron facility. By simultaneously tracking instantaneous photon-energy fluctuations with a high- resolution photoelectron spectrometer, we minimize systematic uncertainties down to 10–15 meV, or velocity equivalent ±∼5 km s⁻¹ in their rest energies, substantially improving our knowledge of this key astrophysical ion. Our large-scale configuration-interaction computations include more than 4 million relativistic configurations and agree with the experiment at a level without precedent for a 10-electron system. Thereby, theoretical uncertainties for interelectronic correlations become far smaller than those of quantum electrodynamics (QED) corrections. The present QED benchmark strengthens our trust in future calculations of many other complex atomic ions of interest to astrophysics, plasma physics, and the development of optical clocks with highly charged ions.