SYSTEMATIC CALCULATIONS OF ENERGY LEVELS AND TRANSITION RATES OF BE-LIKE IONS WITH
                    <i>Z</i>
                    = 10–30 USING A COMBINED CONFIGURATION INTERACTION AND MANY-BODY PERTURBATION THEORY APPROACH

Wang, K.; Guo, Xue; Liu, H. T.; Li, D. F.; Long, F. Y.; Han, Xuefeng; Duan, Bin; Li, J. G.; Huang, Min; Wang, Y. S.; Hutton, R.; Zou, Yaming; Zeng, Jiaolong; Chen, C. Y.; Yan, Jun

doi:10.1088/0067-0049/218/2/16

Cited by 74 publications

(29 citation statements)

References 85 publications

(97 reference statements)

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“…Gu (2008) implemented this method in the FAC package, which has successfully been used to calculate atomic data of high accuracy (Gu 2005b(Gu , 2007Wang et al 2014Wang et al , 2015Wang et al , 2016aSi et al 2016). In this method, the Hilbert space of the system is divided into two subspaces, including a model space M and an orthogonal space N .…”

Section: Mbptmentioning

confidence: 99%

“…These observations require theoretical studies to supply more extensive atomic data of high accuracy. Considering this, we have recently provided accurate atomic data for L-shell ions, including the beryllium, boron, carbon, nitrogen, fluorine, and neon isoelectronic sequences Ekman et al 2014;Wang et al 2014Wang et al , 2015Wang et al , 2016aRadžiūtė et al 2015;Si et al 2016). In this paper, systematic calculations for oxygen-like ions from Cr XVII to Zn XXIII are reported.…”

Section: Introductionmentioning

confidence: 99%

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Extended Calculations of Spectroscopic Data: Energy Levels, Lifetimes, and Transition Rates for O-like Ions from Cr xvii to Zn xxiii

Wang

Jönsson

Ekman

et al. 2017

ApJS

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Employing two state-of-the-art methods, multiconfiguration Dirac-Hartree-Fock and second-order many-body perturbation theory, the excitation energies and lifetimes for the lowest 200 states of the 2s 2 2p 4 , 2s2p 5 , 2p 6 , 2s 2 2p 3 3s, 2s 2 2p 3 3p, 2s 2 2p 3 3d, 2s2p 4 3s, 2s2p 4 3p, and 2s2p 4 3d configurations, and multipole (electric dipole (E1), magnetic dipole (M1), and electric quadrupole (E2)) transition rates, line strengths, and oscillator strengths among these states are calculated for each O-like ion from Cr XVII to Zn XXIII. Our two data sets are compared with the NIST and CHIANTI compiled values, and previous calculations. The data are accurate enough for identification and deblending of new emission lines from the sun and other astrophysical sources. The amount of data of high accuracy is significantly increased for the n = 3 states of several O-like ions of astrophysics interest, where experimental data are very scarce.

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Section: Mbptmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Extended Calculations of Spectroscopic Data: Energy Levels, Lifetimes, and Transition Rates for O-like Ions from Cr xvii to Zn xxiii

Wang

Jönsson

Ekman

et al. 2017

ApJS

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“…The second-order MBPT approach (Lindgren 1974;Safronova et al 1996), implemented by Gu (2005Gu ( , 2006 in FAC has been used successfully to calculate atomic parameters with high accuracy (Gu 2007;Gu et al 2011;Wang et al 2014;Fei et al 2014;Guo et al 2015;Wang et al 2015;Si et al 2015a,b). Here we briefly describe the theory.…”

Section: Mbptmentioning

confidence: 99%

Energy levels and transition rates for helium-like ions withZ = 10–36

Guo

Wang

et al. 2016

A&A

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Aims. Helium-like ions provide an important X-ray spectral diagnostics in astrophysical and high-temperature fusion plasmas. An interpretation of the observed spectra provides information on temperature, density, and chemical compositions of the plasma. Such an analysis requires information for a wide range of atomic parameters, including energy levels and transition rates. Our aim is to provide a set of accurate energy levels and transition rates for helium-like ions with Z = 10-36. Methods. The second-order many-body perturbation theory (MBPT) was adopted in this paper. To support our MBPT results, we performed an independent calculation using the multiconfiguration Dirac-Hartree-Fock (MCDHF) method. Results. We provide accurate energies for the lowest singly excited 70 levels among 1snl (n ≤ 6, l ≤ (n − 1)) configurations and the lowest doubly excited 250 levels arising from the K-vacancy 2ln l (n ≤ 6, l ≤ (n − 1)) configurations of helium-like ions with Z = 10−36. Wavelengths, transition rates, oscillator strengths, and line strengths are calculated for the E1, M1, E2, and M2 transitions among these levels. The radiative lifetimes are reported for all the calculated levels. Conclusions. Our MBPT results for singly excited n ≤ 2 levels show excellent agreement with other elaborate calculations, while those for singly excited n ≥ 3 and doubly excited levels show significant improvements over previous theoretical results. Our results will be very helpful for astrophysical line identification and plasma diagnostics.

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“…This MBPT approach has been proved to be significant improvement in accuracy compared with the relativistic configuration interaction (RCI) method in the FAC code. 27,28 The close-coupling R-matrix approach 29 were utilized to provide the collision strength of electron impact excitation. In order to include the cascade contribution on the excited level population, the collision excitation from the ground or lower n states to higher n states which were not offered by R-matrix data were solved via the relativistic distorted wave (DW) method in FAC.…”

Section: Calculationmentioning

confidence: 99%

Responsivity calibration of the extreme ultraviolet spectrometer in the range of 175-435 Å

et al. 2017

AIP Advances

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We reported the relative responsivity calibration of the grazing-incidence flat-field EUV spectrometer between 175 and 435 Å by means of two methods. The first method is implemented by measuring the diffraction efficiency of the grating with synchrotron radiation light source. Considering the transmission efficiency and quantum efficiency of the other optical components in the spectrometer, the total responsivity was then obtained. The second one was carried out by measuring line emissions from C3+, N4+ and O3+ ions at Shanghai high temperature super conductor electron beam ion trap (SH-HtscEBIT). The EUV spectra were also simulated theoretically via a collisional radiative model. In the calculation, the second-order relativistic many-body perturbation theory approach based on the flexible atomic code was used to calculate the energy levels and transition rates; the close-coupling R-matrix approach and relativistic distorted wave method were utilized to calculate the collision strength of electron impact excitation. In comparison with the spectroscopic measurements at EBIT device, the differences between the measured and simulated relative line intensities were obtained. The responsivity calibration for the spectrometer was then achieved by a 3rd degree polynomial function fitting. Our measurement shows that the responsivity between 175 and 435 Å varies by factor of ∼ 46. The two results of calibration demonstrated a consistency within an average deviation of 24%. In addition, an evaluation of our calculations on C iv, N v and O iv line emissions in this wavelength region was given.

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SYSTEMATIC CALCULATIONS OF ENERGY LEVELS AND TRANSITION RATES OF BE-LIKE IONS WITH Z = 10–30 USING A COMBINED CONFIGURATION INTERACTION AND MANY-BODY PERTURBATION THEORY APPROACH

Cited by 74 publications

References 85 publications

Extended Calculations of Spectroscopic Data: Energy Levels, Lifetimes, and Transition Rates for O-like Ions from Cr xvii to Zn xxiii

Extended Calculations of Spectroscopic Data: Energy Levels, Lifetimes, and Transition Rates for O-like Ions from Cr xvii to Zn xxiii

Energy levels and transition rates for helium-like ions withZ = 10–36

Responsivity calibration of the extreme ultraviolet spectrometer in the range of 175-435 Å

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