X-ray measurements in helium-like atoms increased discrepancy between experiment and theoretical QED

Chantler, Christopher T.; Payne, A T; Gillaspy, John D.; Hudson, L. T.; Smale, L. F.; Henins, Albert; Kimpton, Justin A.; Takács, Endre

doi:10.1088/1367-2630/16/12/123037

Cited by 17 publications

(15 citation statements)

References 56 publications

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“…When older calculations were used as a reference, we used the energies of Ref. [59] to obtain an updated value for this table. A detailed analysis of the difference between theory [59] and experiment has been performed in previous work [3,5,8]. Here we provide an updated analysis, which include our new result and the data from Tables VII and VIII .…”

Section: Comparison Between Measurements and Calculations For 12 ≤mentioning

confidence: 92%

High-precision measurements of n=2→n=1 transition energies and level widths in He- and Be-like argon ions

et al. 2018

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We performed a reference-free measurement of the transition energies of the 1s2p 1 P 1 → 1s 2 1 S 0 line in He-like argon, and of the 1s2s 2 2p 1 P 1 → 1s 2 2s 2 1 S 0 line in Be-like argon ions. The highlycharged ions were produced in the plasma of an Electron-Cyclotron Resonance Ion Source. Both energy measurements were performed with an accuracy better than 3 parts in 10 6 , using a double flat-crystal spectrometer, without reference to any theoretical or experimental energy. The 1s2s 2 2p 1 P 1 → 1s 2 2s 2 1 S 0 transition measurement is the first reference-free measurement for this core-excited transition. The 1s2p 1 P 1 → 1s 2 1 S 0 transition measurement confirms recent measurement performed at the Heidelberg Electron-Beam Ion Trap (EBIT). The width measurement in the He-like transition provides test of a purely radiative decay calculation. In the case of the Be-like argon transition, the width results from the sum of a radiative channel and three main Auger channels. We also performed Multiconfiguration Dirac-Fock (MCDF) calculations of transition energies and rates and have done an extensive comparison with theory and other experimental data. For both measurements reported here, we find agreement with the most recent theoretical calculations within the combined theoretical and experimental uncertainties.

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Section: Comparison Between Measurements and Calculations For 12 ≤mentioning

confidence: 92%

High-precision measurements of n=2→n=1 transition energies and level widths in He- and Be-like argon ions

et al. 2018

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“…[32]. Later, drawing on the x-ray transition measurements in He-like titanium and statistical treatment of the previous experimental data, Chantler et al [33,34] claimed that a divergence between the experimental results and the theory from Ref. [32] growing as Z 3 takes place.…”

Section: Introductionmentioning

confidence: 99%

“…New measurements of the transition energies in middle-Z heliumlike ions have been undertaken [35][36][37][38][39][40], and the obtained results fall outside the Z 3 -trend predicted in Refs. [33,34]. Moreover, new statistical studies [38,40,41], which include the extended sets of experimental data, have shown that there is no evidence for the aforementioned Zdependent deviation.…”

Section: Introductionmentioning

confidence: 99%

QED calculation of electron-electron correlation effects in heliumlike ions

et al. 2019

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Fully relativistic approach to evaluate the correlation effects in highly charged ions is presented. The interelectronic-interaction contributions of first and second orders in 1/Z are treated rigorously within the framework of bound-state quantum electrodynamics, whereas the calculations of the third-and higherorder contributions are based on the Dirac-Coulomb-Breit Hamiltonian. The developed approach allows one to deal with single as well as degenerate or quasi-degenerate states. We apply this approach to the calculations of the correlation contributions to the n = 1 and n = 2 energy levels in heliumlike ions.The obtained contributions are combined with the one-electron and screened QED corrections, nuclear recoil and nuclear polarization corrections to get the total theoretical predictions for the ionization and transition energies in high-Z heliumlike ions. * Corresponding author: a.v.malyshev@spbu.ru 1

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“…A new great interest to middle-Z heliumlike ions has been triggered by Chantler and co-authors [33,34]. In Ref.…”

Section: Introductionmentioning

confidence: 99%

QED calculations of the n=2 to n=1 x-ray transition energies in middle- Z heliumlike ions

et al. 2019

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Ab initio QED calculations of the four x-ray transitions from the L to K shell in heliumlike argon, titanium, iron, copper, and krypton are performed. The binding energies for all the n = 1 and n = 2 states are evaluated as well. The calculation approach combines the rigorous QED treatment in the first two orders of the perturbation theory constructed within the extended Furry picture with the third-and higher-order correlation effects evaluated in the Breit approximation. The obtained results are compared with the previous evaluations and available experimental data.

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X-ray measurements in helium-like atoms increased discrepancy between experiment and theoretical QED

Cited by 17 publications

References 56 publications

High-precision measurements of n=2→n=1 transition energies and level widths in He- and Be-like argon ions

High-precision measurements of n=2→n=1 transition energies and level widths in He- and Be-like argon ions

QED calculation of electron-electron correlation effects in heliumlike ions

QED calculations of the n=2 to n=1 x-ray transition energies in middle- Z heliumlike ions

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