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Parts-per-million-accurate determination of the Kα photoionization resonance of Be-like oxygen with resolution of its O16–O18 isotopic shift

Jonas Danisch1,*, Marc Botz1,2, Chintan Shah3,4,1,†, Moto Togawa1,5, Joschka Goes1, Dominic Hache1, Filipe Grilo1,6, Pedro Amaro6,‡, Vladimir A. Yerokhin1 et al.

Steffen Kühn1, Awad Mohamed7,8, Roberta Totani8,9, Monica de Simone10, Stefano Orlando8, Thomas Pfeifer1, Fabrizio Nicastro11, Marcello Coreno8,9, and José R. Crespo López-Urrutia1,§

  • *Contact author: jonas.danisch@mpi-hd.mpg.de
  • †Contact author: chintan.shah@mpi-hd.mpg.de
  • ‡Contact author: pdamaro@fct.unl.pt
  • §Contact author: crespojr@mpi-hd.mpg.de
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Phys. Rev. A 113, 022811 – Published 12 February, 2026

DOI: https://doi.org/10.1103/d4h7-ykwn

Abstract

We determine with high accuracy the energy of the inner-shell transition 1s22s2S01→1s2s22p3/2P11OKα4+16 at 554.372(3) eV (λ=22.36480(12)Å) as well as its small shift of 2.2±1.3 meV (Δλ=0.089(52)mÅ) for the O18 isotope. This transition blends with a Kα line of O5+ used in astrophysical diagnostics, potentially affecting its reliability. In contrast to our experimental uncertainty of ±3 meV, advanced electronic structure predictions for this four-electron system, including quantum electrodynamic (QED) corrections on the order of 100 meV, still scatter by more than ±250 meV. Ions generated and stored in an electron beam ion trap were excited at the ELETTRA synchrotron facility with monochromatic soft x rays, with photon energies corrected by an additional spectrometer. Upon resonant excitation of O4+ and their subsequent autoionization, we separate the photoions of each isotope by a time-of-flight measurement. This way, we resolve soft x-ray isotopic shifts of a few meV, obtain very accurate data on essential astrophysical ions, and test calculations down to the level of QED contributions.

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Corrections

30 June, 2026

Correction: Errors in the charge state labeling in Fig. 3 have been fixed. In Sec. II, paragraph 2, sentence 5, q/m has been changed to m/q.

Article Text

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Phys. Rev. A 113, 022811– Published 12 February, 2026
  • Received 24 July 2025
  • Accepted 16 January 2026
  • Corrected 30 June 2026
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