Theoretical investigation on the soft X-ray spectrum of the highly-charged W54+ ions

Ding, Xin; Yang, Jiaoxia; Koike, Fumihiro; Murakami, Izumi; Kato, Daiji; Sakaue, Hiroyuki; Nakamura, Nobuyuki; Dong, Chenzhong

doi:10.1016/j.jqsrt.2017.08.020

Cited by 16 publications

(7 citation statements)

References 27 publications

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“…Our theoretical results are in good agreement with experiments and show a clear improvement of accuracy over previous calculations. [5,6,[102][103][104][105][106][107][108][109][110][111][112][113] And our calculations achieve spectroscopic accuracy to assist spectroscopists in their assignment and direct identification. Based on our RMBPT and MCDHF calculations and CRM simulations, we also give suggestions of assignments for all of the unidentified 28 spectral lines (a significant fraction, around sixty percent) of the n = 3 → 3 transitions measured by Lennartsson et al [114] Additionally, the contributions of electron correlation, the Breit interaction, the higher-order frequency-dependent retardation correction, and the leading QED corrections to excitation energies (transition wavelengths, and radiative rates) are also studied in detail.…”

Section: M-shell and N-shell Tungsten Ionsmentioning

confidence: 78%

Benchmarking calculations of excitation energies and transition properties with spectroscopic accuracy of highly charged ions used for the fusion plasma and astrophysical plasma

Zhang

Wang

et al. 2023

Chinese Phys. B

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Atomic radiative data such as excitation energies, transition wavelengths, radiative rates, and level lifetimes with high precision are the essential parameters for the abundance analysis, simulation, and diagnostics in fusion and astrophysical plasmas. In this work, we mainly focus on reviewing our two projects performed in the past decade. One is about the ions with Z ≲ 30 that are generally of astrophysical interest, and the other one is about the highly charged krypton (Z = 36) and tungsten (Z = 74) ions that are relevant in research of magnetic confinement fusion. Two different and independent methods, namely, multiconfiguration Dirac–Hartree–Fock (MCDHF) and the relativistic many-body perturbation theory (RMBPT) are usually used in our studies. As a complement/extension to our previous works for highly charged tungsten ions with open M-shell and open N-shell, we also mainly focus on presenting and discussing our complete RMBPT and MCDHF calculations for the excitation energies, wavelengths, electric dipole (E1), magnetic dipole (M1), electric quadrupole (E2), and magnetic quadrupole (M2) transition properties, and level lifetimes for the lowest 148 levels belonging to the 3l 3 configurations in Al-like W61+. We also summarize the uncertainties of our systematical theoretical calculations, by cross-checking/validating our datasets from our RMBPT and MCDHF calculations, and by detailed comparisons with available accurate observations and other theoretical calculations. The data are openly available in Science Data Bank at https://doi.org/10.57760/sciencedb.10569.

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Section: M-shell and N-shell Tungsten Ionsmentioning

confidence: 78%

Benchmarking calculations of excitation energies and transition properties with spectroscopic accuracy of highly charged ions used for the fusion plasma and astrophysical plasma

Zhang

Wang

et al. 2023

Chinese Phys. B

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“…There are 2,078 levels in the present CRM. The configuration interaction effects were taken into account by the same scheme as in our previous work [25] which was found to adequately describe the most important electron correlation effects in the W 54+ ion. All the necessary fundamental atomic data, such as the energy levels, radiative transition rates (E1, M1, E2, M2), and cross sections of collisional (de)excitation were calculated by the RCI and distorted wave methods, as implemented in the Flexible Atomic Code (FAC) package [26].…”

Section: Theoretical Methodsmentioning

confidence: 99%

“…The results were in reasonable agreement with available experimental and theoretical values. They also constructed a detailed-level collisional-radiative model to simulate the visible spectrum of M1 transitions of W 26+ [24] and the soft X-ray spectrum of E1 transitions of W 54+ [25], which had been observed in var-ious EBIT experiments. The present work is devoted to interpretation of the observed M1 spectrum from the previous EBIT experiment [14,15].…”

Section: Introductionmentioning

confidence: 99%

Collisional radiative model for the M1 transition spectrum of the highly-charged W 54+ ions

et al. 2018

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A detailed-level collisional-radiative model for the M1 transition spectrum of the Ca-like W 54+ ion as observed in an electron beam ion trap (EBIT) was constructed based on atomic data calculated by the relativistic configuration interaction method and distorted wave theory. The present calculated transition energy, rate and intensity of W 54+ M1 transitions are compared with previous theoretical and experimental values. The results are in reasonable agreement with the available experimental and theoretical data. The synthetic spectrum explained the EBIT spectrum in the 12-20 nm region, while a new possibly strong transition has been predicted to be observable with an appropriate electron beam energy. The present work provides accurate atomic data that may be used in plasma diagnostics applications. ✩ Please cite this article in press as: X.Ding et al., Collisional radiative model for the M1 transition spectrum of the highly-charged W 54+ ions, Phys. Lett. A (2018), https://doi.

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“…The RCI method is widely used due to its high-efficiency and credible predictions for experimental findings [52,[58][59][60][61]. As a starting point, it constructs a fictitious mean configuration with fractional occupation numbers that takes into account the electron screening of the involved configurations.…”

Section: A Fac Calculationsmentioning

confidence: 99%

Visible spectra of W8+ in an electron-beam ion trap

Yan

et al. 2021

Phys. Rev. A

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To provide spectroscopic data for lowly charged tungsten ions relevant to fusion research, this work focuses on the W 8+ ion. Six visible spectra lines from W 8+ in the range of 420-660 nm are observed with a compact electron-beam ion trap in Shanghai. Furthermore, transition energies are calculated for the 30 lowest levels of the 4𝑓 14 5𝑠 2 5𝑝 4 , 4𝑓 13 5𝑠 2 5𝑝 5 and 4𝑓 12 5𝑠 2 5𝑝 6 configurations of W 8+ by using the flexible atomic code (FAC) and GRASP package, respectively. Reasonably good agreement is found between our two independent atomic-structure calculations. The resulting atomic parameters are adopted to simulate the spectra based on the collisional-radiative model implemented in the FAC code. This assists us with identification of six strong magnetic dipole transitions in the 4𝑓 13 5𝑠 2 5𝑝 5 and 4𝑓 12 5𝑠 2 5𝑝 6 configurations from our experiments.

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Theoretical investigation on the soft X-ray spectrum of the highly-charged W54+ ions

Abstract: A for the future EBIT experiment with electron density n e = 10 12 cm −3 and electron beam energy E e = 18.2 keV.

Cited by 16 publications

References 27 publications

Benchmarking calculations of excitation energies and transition properties with spectroscopic accuracy of highly charged ions used for the fusion plasma and astrophysical plasma

Benchmarking calculations of excitation energies and transition properties with spectroscopic accuracy of highly charged ions used for the fusion plasma and astrophysical plasma

Collisional radiative model for the M1 transition spectrum of the highly-charged W 54+ ions

Visible spectra of W8+ in an electron-beam ion trap

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