R-matrix calculations of photoionization cross section of Ne-like tungsten

Khatri, Indu; Goyal, Arun; Aggarwal, Sunny; Singh, A.K.; Mohan, Man

doi:10.1139/cjp-2015-0093

Cited by 6 publications

(5 citation statements)

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“…After this, several x-ray lines were precisely measured using EBIT [20][21][22]. Recently, Khatri et al [23] calculated photoioization cross section of Ne-like tungsten using R-matrix method. More recently, Aggarwal and keenan [24] calculated energy levels and radiative rates for 121 levels of W LXV.…”

Section: Introductionmentioning

confidence: 99%

Atomic data for Ne-like ions useful in plasma diagnostic

2018

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Motived by the recent measurement of transition lines for Ne-like Hf and W, we have reported atomic data in the form of multiconfiguration Dirac–Fock transition energies and wavefunction compositions of 209 levels belonging to the configurations 2s22p6, 2s22p5ns (n = 3, 4, 5, 6, 7), 2s22p5np (n = 3, 4, 5, 6, 7), 2s22p5nd (n = 3, 4, 5, 6, 7), 2s22p5nf (n = 4, 5), 2s22p55g, 2s2p6ns (n = 3, 4, 5), 2s2p6np (n = 3, 4, 5), 2s2p6nd (n = 3, 4, 5), 2s2p6nf (n = 4, 5), and 2s2p65g of Hf LXIII, Ta LXIV, W LXV, and Re LXVI. Radiative rates, oscillator strengths, transition wavelengths, and line strengths have been calculated for ground state electric dipole (E1) transition among these levels. These values were obtained using GRASP (general-purpose relativistic atomic structure package) code, which includes Breit and QED effects along with Dirac–Fock potential and second-order Coulomb interaction. We have compared our results with the data compiled using FAC (flexible atomic code) and also with the recent results available in the literature. The accuracy of the data is assessed. We predict new energy levels, oscillator strength, and transition probability data, where no other theoretical or experimental results are available, which will form the basis for future experimental work.

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Section: Introductionmentioning

confidence: 99%

Atomic data for Ne-like ions useful in plasma diagnostic

2018

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“…In fact, this kind of resonance peak is very narrow and the corresponding Rydberg resonance series converges quickly to its excitation threshold [58]. From a theoretical point of view, the overlap of these resonant peaks is caused by a relativistic intermixing and coupling of the included channels [39]. It is also found that the resonant peaks beyond the energy 1277.42 Ryd become extremely weak and, hence, further calculations for higher photoionizing energies are not performed in this work.…”

Section: Resultsmentioning

confidence: 93%

“…López et al theoretically studied the direct photoionization of W 63+ and W 64+ ions using a combination of the perturbative dipolar approach and the Sturmian model [38]. Moreover, the photoionization of W 64+ ions was also studied using the Dirac-Coulomb R-matrix method [39].…”

Section: Introductionmentioning

confidence: 99%

Relativistic R-matrix calculations of the photoionization of W⁶³⁺ ions

An¹,

Wu²,

Jiang³

et al. 2021

J. Phys. B: At. Mol. Opt. Phys.

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The direct and resonant single-photon photoionization of W63+ ions from their ground state 1s 22s 22p 63s 2 S 1/2 and four lowly-excited states 1s 22s 22p 63p 2 P 1/2,3/2 and 1s 22s 22p 63d 2 D 3/2,5/2 has been studied within the framework of the relativistic R-matrix method and the multiconfigurational Dirac–Fock method. Special attention has been paid to obtaining direct and resonant ionization limits and to identifying possible resonant symmetries of W63+ ions. To this end, the photoionization cross-sections have been calculated using the Dirac Atomic R-matrix Code package. Direct and resonant ionization limits were obtained for the ground-state photoionization of W63+ ions, and the resonant peaks identified were found to be associated with the resonances 1s 22s 22p 53lnl′ and 1s 22s2p 63lnl′ (l, l′ = s, p, d) for the fine-structured energy level or configuration at the level of fine structure or configuration. For excited-state photoionization, however, the resonant ionization limits and resonant peaks were hardly distinguishable due to much more densely spaced resonant peaks and a complicated resonant structure, although the respective direct ionization limits are obtained. We expect that this work will remedy the current lack of fundamental studies of the photoionization of W63+ ions and be helpful in the diagnosis and simulation of fusion plasmas in conjunction with the available photoionization data for tungsten ions in other charge states.

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“…The accuracy of the method depends on the number of configurations required to achieve a desired accuracy. We have also applied this method in our previous work [64][65][66][67][68][69][70][71][72][73][74]. In Table 1 Table 1-3, one can see that the contribution of Breit and QED corrections are equal in the order of 10 -2 for all levels except level number 3 and 27.…”

Section: Energy Levelsmentioning

confidence: 92%

“…To execute accurate and elaborate calculations, we have chosen a fully relativistic MCDF method which was improved by Norrington [62] formerly built by Grant et al [63] and has been successfully implemented in our previous work [64][65][66][67][68][69][70][71][72][73][74]. QED corrections and Breit corrections are taken as a first order perturbation theory.…”

Section: Theoretical Methodsmentioning

confidence: 99%

Atomic structure calculations and study of EUV and SXR spectral lines in Cu-like ions

et al. 2016

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In the present work, we provide the most extensive and detailed study of highly ionized Cu-like ions and diagnose EUV (Extreme Ultraviolet) and SXR (Soft X-ray) transitions with N-shell electron excitation to M-shell and higher shells. We have determined energy levels, lifetimes for lowest 27 fine-structure levels by adopting multi-configuration Dirac-Fock (MCDF) with the inclusion of quantum electrodynamics (QED) as well as Breit corrections as a first order perturbation theory. We have also reported complete radiative data for strong electric dipole transitions within lowest 27 levels. We have compared our calculated results with theoretically calculated and experimentally measured results available in the literature to measure the credibility and genuineness of our results and achieve a good agreement. Further, due to insufficiency of adequate and complete atomic data for higher levels of highly ionized Cu-like ions in the literature, we have performed other equivalent parallel calculations by implementing fully relativistic distorted wave flexible atomic code (FAC) to ensure the accuracy of our results. Additionally, we have also presented transition wavelengths of Nα transitions of high Z Cu-like ions by using Moseley's law. We believe that the large amount of atomic data presented in this paper may be useful in fusion and astrophysical plasma and in several applications especially in lithography and cell biology.PACS. 32.70.Cs Oscillator strengths, lifetimes -32.10.Fn Fine and hyperfine structure

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R-matrix calculations of photoionization cross section of Ne-like tungsten

Cited by 6 publications

References 59 publications

Atomic data for Ne-like ions useful in plasma diagnostic

Atomic data for Ne-like ions useful in plasma diagnostic

Relativistic R-matrix calculations of the photoionization of W⁶³⁺ ions

Atomic structure calculations and study of EUV and SXR spectral lines in Cu-like ions

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R-matrix calculations of photoionization cross section of Ne-like tungsten

Cited by 6 publications

References 59 publications

Atomic data for Ne-like ions useful in plasma diagnostic

Atomic data for Ne-like ions useful in plasma diagnostic

Relativistic R-matrix calculations of the photoionization of W63+ ions

Atomic structure calculations and study of EUV and SXR spectral lines in Cu-like ions

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Relativistic R-matrix calculations of the photoionization of W⁶³⁺ ions