Breit and QED contributions in atomic structure calculations of tungsten ions

Kozioł, Karol

doi:10.1016/j.jqsrt.2019.106772

Cited by 8 publications

(5 citation statements)

References 59 publications

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“…The corresponding correction value was perturbatively computed in the RCI calculation through the exchange of a single transverse photon in the low-frequency limit 41,68 . Comparing the Breit contributions obtained from the perturbative approach to calculations in which the Breit term is included in a variational SCF process allows us to estimate the uncertainty due to the perturbative approach 69,70 . Previous studies have found that the magnitude of this effect is less than 0.3% in the Ni-like case (among others) 69,70 and that it is significantly reduced when the active space is expanded.…”

Section: Estimation Of Uncertainties For the Theoretical Valuesmentioning

confidence: 99%

“…Comparing the Breit contributions obtained from the perturbative approach to calculations in which the Breit term is included in a variational SCF process allows us to estimate the uncertainty due to the perturbative approach 69,70 . Previous studies have found that the magnitude of this effect is less than 0.3% in the Ni-like case (among others) 69,70 and that it is significantly reduced when the active space is expanded. Here, we assume the maximum error owing to the perturbative treatment and adopt a 0.5% uncertainty related to the Breit correction.…”

Section: Estimation Of Uncertainties For the Theoretical Valuesmentioning

confidence: 99%

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Hyperfine-structure-resolved laser spectroscopy of many-electron highly charged ions

et al. 2023

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Hyperfine structures of highly charged ions (HCIs) are favourable spectroscopic targets for exploring fundamental physics along with nuclear properties. Recent proposals of HCI atomic clocks highlight their importance, especially for many-electron HCIs, and they have been theoretically investigated by refining atomic-structure calculations. However, developments in hyperfine spectroscopy of many-electron HCIs have not proceeded due to experimental difficulty. Here, we demonstrate hyperfine-structure-resolved laser spectroscopy of HCIs in an electron beam ion trap plasma, employing the magnetic-dipole transition in the 4d95s state of 127I7+. Ion-state manipulation by controlled electron collisions in the well-defined laboratory plasma enables laser-induced fluorescence spectroscopy of trapped HCIs. The observed spectrum of evaporatively cooled ions under low magnetic fields shows characteristic features reflecting the hyperfine structures. The present demonstration using combined optical and plasma approaches provides a benchmark for state-of-the-art atomic calculations of hyperfine structures in many-electron HCIs, and offers possibilities for a variety of unexploited experiments.

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Section: Estimation Of Uncertainties For the Theoretical Valuesmentioning

confidence: 99%

Section: Estimation Of Uncertainties For the Theoretical Valuesmentioning

confidence: 99%

Hyperfine-structure-resolved laser spectroscopy of many-electron highly charged ions

et al. 2023

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“…Using the GRASP0 code [24], excitation energies and transition probabilities for W 57+ were estimated by Mohan et al [25]. The energy of 3p 3/2 − 3p 1/2 fine splitting in W 57+ was studied by Kozioł [26] using GRASP2K [27], MCDFGME [28,29] and FAC [17] codes.…”

Section: Introductionmentioning

confidence: 99%

Benchmarking calculations with spectroscopic accuracy of excitation energies and wavelengths in sulfur-like tungsten

et al. 2020

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Atomic properties of S-like W are evaluated through a state-of-the-art method, namely, the multiconfiguration Dirac-Hartree-Fock (MCDHF) method combined with the relativistic configuration interaction (RCI) approach. The level energies, wavelengths, and transition parameters involving the 88 lowest levels of W +58 (W LIX) are calculated. We discuss in detail the relative importance of the valence-and core-valence electron correlation effects, the Breit interaction, the higher order retardation correction beyond the Breit interaction through the transverse photon interaction, and the quantum electrodynamical (QED) corrections. The present level energies are highly accurate, with uncertainties close to what can be achieved from spectroscopy. As such, they provide benchmark tests for other theoretical calculations of S-like W and should assist the spectroscopists in their assignment/identification of observed lines in complex spectra.

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“…For autoionizing final states, both the ground configuration 2s 2 2p 6 3s 2 and the lower single-and double-excited configurations 2s 2 2p 6 3lnl' (l = s, p, d and n = 3-5, l' ≤ n−1) of Mg-like Au 67+ ions were included. Using the FAC code (Version 1.1.5) proposed by Gu [17], which included Berit interactions in the zero-energy limit for the exchanged photons, and quantum electrodynamic (QED) effects [31], we carefully calculated the energy levels and radiative and autoionization rates of Al-like Au 66+ ions. Note that configuration mixing between all the radiative final states and the resonant excited states from DR and TR were included in the calculations.…”

Section: Resultsmentioning

confidence: 99%

Theoretical Investigation of Electron–Ion Recombination Process of Mg-like Gold

Xie

Niu

et al. 2023

Atoms

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The L-shell dielectronic and trielectronic recombinations of highly charged Mg-like gold ions (Au67+) in the ground state 2s22p63s2 1S0 have been studied systematically. The recombination cross-sections and rate coefficients are carefully calculated for ∆n = 1 (2s/2p → 3l) transitions using a flexible atomic code based on the relativistic configuration interaction method and considering the Breit and QED corrections. Detailed resonance energies and resonance strengths are presented for the stronger resonances of the LMn (n = 3–12) series. It is found that the contributions of the trielectronic recombination to the total cross-section is about 13.75%, which cannot be neglected. For convenience of application, the plasma rate coefficients are also calculated and fitted to a semiempirical formula, and in the calculations, the contributions from the higher excited resonance groups n ≥ 13 are evaluated by an extrapolation method, which is about 2.93% of the total rate coefficient.

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Breit and QED contributions in atomic structure calculations of tungsten ions

Cited by 8 publications

References 59 publications

Hyperfine-structure-resolved laser spectroscopy of many-electron highly charged ions

Hyperfine-structure-resolved laser spectroscopy of many-electron highly charged ions

Benchmarking calculations with spectroscopic accuracy of excitation energies and wavelengths in sulfur-like tungsten

Theoretical Investigation of Electron–Ion Recombination Process of Mg-like Gold

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