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Jonauskas, V.; Kynienė, Aušra; Kučas, S.; Pakalka, S.; Masys, Šarūnas; Prancikevičius, A.; Borovik, A.; Gharaibeh, M. F.; Schippers, S.; Müller, A.

doi:10.1103/physreva.100.062701

Cited by 33 publications

(28 citation statements)

References 77 publications

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“…The fractional populations of the metastable levels are generally not known. Common assumptions are a statistical level distribution or a Maxwell-Boltzmann distribution which accounts for the plasma temperature in the ion source [21]. In principle, more detailed information about the metastable fractions can be obtained from comparisons with theoretical cross sections if these are known with sufficient precision.…”

Section: Cross Sectionsmentioning

confidence: 99%

Electron-impact single ionisation of W^q+ions: experiment and theory for 11 ≤ q ≤ 18

Schury

Borovik

Ebinger

et al. 2019

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

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Absolute cross sections for electron-impact single ionisation (EISI) of multiply charged tungsten ions (W q+ ) with charge states in the range 11 ≤ q ≤ 18 in the electron-ion collision energy ranges from below the respective ionisation thresholds up to 1000 eV were measured employing the electron-ion crossed-beams method. In order to extend the results to higher energies, cross section calculations were performed using the subconfiguration-averaged distorted-wave (SCADW) method for electron-ion collision energies up to 150 keV. From the combined experimental and scaled theoretical cross sections rate coefficients were derived which are compared with the ones contained in the ADAS database and which are based on the configuration-averaged distorted wave (CADW) calculations of Loch et al. [Phys. Rev. A 72, 052716 (2005)]. Significant discrepancies were found at the temperatures where the ions investigated here are expected to form in collisionally ionised plasmas. These discrepancies are attributed to the limitations of the CADW approach and also the more detailed SCADW treatment which do not allow for a sufficiently accurate description of the EISI cross sections particularly at the ionisation thresholds.

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Section: Cross Sectionsmentioning

confidence: 99%

Electron-impact single ionisation of W^q+ions: experiment and theory for 11 ≤ q ≤ 18

Schury

Borovik

Ebinger

et al. 2019

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

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“…The study included 71 even and 50 odd configurations, having the highest values of configuration interaction strengths. This approach was previously successfully used to analyze energy levels, Auger cascades, electron-impact excitation, and ionization cross-sections [20][21][22].…”

Section: Theoretical Methodsmentioning

confidence: 99%

“…Since, to our knowledge, there are no theoretical calculations of excitation cross-section for the 6s 2 6p 2 P o 1/2 → 6s 2 6d 2 D 5/2 transition available in the literature, we performed our own calculation of the excitation cross-section for this transition as well as for the 2 P o 1/2 → 2 D 3/2 transition using Flexible Atomic Code package (FAC) [19]. So far, FAC is the convenient tool for constructing high-quality wave functions of electron scattering on atoms and ions and has proven to be good for the analysis of energy levels, Auger cascades, electron-impact excitation, and ionization cross-sections [20][21][22]. Likewise, in the GRASP2k package used in the calculation [16], FAC also incorporates a core-valence correlation, configuration mixing, and relativistic effects, which are very important to account for in the case of such a heavy ion as singly charged lead.…”

Section: Introductionmentioning

confidence: 99%

Excitation of the 6d 2D → 6p 2Po Radiative Transitions in the Pb+ Ion by Electron Impact

Roman¹,

Jonauskas²,

Kučas³

et al. 2021

Atoms

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Results of experimental and theoretical investigation of electron-impact excitation of the 6s26d D2→6s26p P2o spectral transitions from the ground 6s26p P21/2o level in the Pb+ ion are presented. The experimental excitation functions for the transitions, measured by a VUV spectroscopy method, using the crossed electron and ion beams technique, reveal a rather distinct resonance structure resulting mainly from the electron decay of both atomic and ionic autoionizing states. The absolute values of the emission cross-sections, obtained by normalizing the experimental data at the incident electron energy 100 eV by those calculated using the Flexible Atomic Code software package, were found to be (0.35 ± 0.17) × 10–16 cm2 for the 6s26d D23/2 → 6s26p P21/2o (λ143.4 nm) transition and (0.19 ± 0.09) × 10–16 cm2 for the 6s26d D25/2 → 6s26p P23/2o (λ182.2 nm) transition.

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“…for ions in the ground configuration, the presence of metastable ions potentially influences the measured cross sections. Usually, the metastable fractions of ions are not known and must be inferred from detailed comparisons with theoretical calculations as shown recently, e.g., for W 5+ [11].…”

Section: Hybrid Scawd+lldw Cross Sectionsmentioning

confidence: 99%

“…On the theory side, configuration-averaged distorted wave (CADW) calculations have been widely used for EISI calculations because of the efficiency of this method in generating large numbers of cross sections and plasma rate coefficients [7][8][9][10]. More elaborate level-resolved calculations have been carried out only for a limited number of ion species such as W 5+ [11], W 17+ [12], W 25+ [13], W 26+ [14], and W 27+ [15].…”

Section: Introductionmentioning

confidence: 99%

Hybrid subconfiguration-average and level-to-level distorted-wave treatment of electron-impact single ionisation of W$^{15+}$ and W$^{16+}$

Jin,

Borovik,

Ebinger

et al. 2020

Preprint

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Recently, we have demonstrated (Jin et al 2020 J. Phys. B: At. Mol. Opt. Phys. 53 075201) that a hybrid subconfiguration-average and level-to-level distorted wave treatment of electron-impact single ionisation (EISI) of W 14+ ions represents an accurate and manageable approach for the calculation of EISI cross sections of a complex ion. Here we demonstrate the more general validity of this approach by comparing hybrid cross sections for EISI of W 15+ and W 16+ with the recent experimental results of Schury et al. (2020 J. Phys. B: At. Mol. Opt. Phys. 53 015201). Our calculations also account for the resonant-excitation double autoionisation (REDA) process which is important in the electron energy range 370-600 eV and for the possible presence of initially metastable ions in the experiment.

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Electron-impact ionization ofW5+

Cited by 33 publications

References 77 publications

Electron-impact single ionisation of W^q+ions: experiment and theory for 11 ≤ q ≤ 18

Electron-impact single ionisation of W^q+ions: experiment and theory for 11 ≤ q ≤ 18

Excitation of the 6d 2D → 6p 2Po Radiative Transitions in the Pb+ Ion by Electron Impact

Hybrid subconfiguration-average and level-to-level distorted-wave treatment of electron-impact single ionisation of W$^{15+}$ and W$^{16+}$

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Electron-impact ionization ofW5+

Cited by 33 publications

References 77 publications

Electron-impact single ionisation of W q+ions: experiment and theory for 11 ≤ q ≤ 18

Electron-impact single ionisation of W q+ions: experiment and theory for 11 ≤ q ≤ 18

Excitation of the 6d 2D → 6p 2Po Radiative Transitions in the Pb+ Ion by Electron Impact

Hybrid subconfiguration-average and level-to-level distorted-wave treatment of electron-impact single ionisation of W$^{15+}$ and W$^{16+}$

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Product

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Electron-impact single ionisation of W^q+ions: experiment and theory for 11 ≤ q ≤ 18

Electron-impact single ionisation of W^q+ions: experiment and theory for 11 ≤ q ≤ 18