Photoionization of tungsten ions: experiment and theory for W<sup>5+</sup>

Müller, A.; Schippers, S.; Hellhund, J.; Kilcoyne, A. L. D.; Phaneuf, R.A.; McLaughlin, B. M.

doi:10.1088/1361-6455/ab39c8

Cited by 7 publications

(2 citation statements)

References 29 publications

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“…Motivated by the importance of tungsten in modern fusion research, a comprehensive experimental programme on studying electron-ion recombination [24][25][26], electron-impact ionisation [27,28] and photoionisation [29][30][31][32] of tungsten ions has been launched [1]. As a part of this campaign, the present study addresses electron-impact single ionisation (EISI) of W q+ ions with charge states 11 ≤ q ≤ 18, thus, extending previous experimental work on EISI of tungsten ions with charge states in the range 1-10 [33].…”

Section: Introductionmentioning

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: Introductionmentioning

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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“…Apart from these studies of the photoionization of neutral tungsten atoms, the photoionization of (highly charged) tungsten ions has also been extensively explored. Müller et al systematically studied, both experimentally and theoretically, the photoionization processes of lowly-charged W + -W 5+ ionsusing a photon-ion merged-beam setup at the advanced light source in Berkeley and the Dirac-Coulomb R-matrix method, respectively [29][30][31][32][33][34]. Trzhaskovskaya and Nikulin performed a systematic Dirac-Fock calculation for the photoionization of W 24+ -W 45+ and W 47+ -W 71+ ions which are of importance to the fusion plasma studies of the ASDEX-U and the ITER, respectively [35,36].…”

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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Angular distribution and polarization of characteristic x-ray lines following innershell photoionization of tungsten by linearly polarized light

Zhang

Dong

2020

Journal of Quantitative Spectroscopy and Radiative Transfer

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Photoionization of tungsten ions: experiment and theory for W⁵⁺

Cited by 7 publications

References 29 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

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

Angular distribution and polarization of characteristic x-ray lines following innershell photoionization of tungsten by linearly polarized light

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Photoionization of tungsten ions: experiment and theory for W5+

Cited by 7 publications

References 29 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

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

Angular distribution and polarization of characteristic x-ray lines following innershell photoionization of tungsten by linearly polarized light

Contact Info

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Photoionization of tungsten ions: experiment and theory for W⁵⁺

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

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