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  • Letter
  • Open Access

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

Moto Togawa1,2,3,*, Steffen Kühn1, Chintan Shah4,5,1,†, Vladimir A. Zaytsev1, Natalia S. Oreshkina1, Jens Buck6, Sonja Bernitt7,8,9,1, René Steinbrügge10, Jörn Seltmann10 et al.

Moritz Hoesch10, Christoph H. Keitel1, Thomas Pfeifer1, Maurice A. Leutenegger4, and José R. Crespo López-Urrutia1,‡

  • *Contact author: togawa@mpi-hd.mpg.de
  • †Present address: Department of Physics and Astronomy, Johns Hopkins University, Baltimore, Maryland 21218, USA.
  • ‡Contact author: crespojr@mpi-hd.mpg.de
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Phys. Rev. A 110, L030802 – Published 4 September, 2024

DOI: https://doi.org/10.1103/PhysRevA.110.L030802

Abstract

The transition energies of the two 1s core-excited soft x-ray lines (dubbed q and r) from 1s22s1S1/2 to the respective upper levels 1s(2S)2s2p(3P)2P3/2 and 2P1/2 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 qr blend used to determine the outflow velocities of active galactic nuclei, ten times smaller than previously possible.

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Phys. Rev. A 110, L030802– Published 4 September, 2024
  • Received 18 October 2023
  • Revised 28 May 2024
  • Accepted 7 August 2024
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