He ii<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>P</mml:mi></mml:mrow><mml:mrow><mml:mi>α</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>Stark broadening and intensity ratio of C iv and C iii lines calibrated with Thomson scattering for high-density plasma diagnostics

Gawron, A.; Maurmann, S.; Böttcher, Fabian; Meckler, A.; Kunze, H.‐J.

doi:10.1103/physreva.38.4737

Cited by 30 publications

(12 citation statements)

References 21 publications

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“…For this experiment, N e was verified with a He-Ne laser interferometric technique. Finally, at higher densities, the precision results recently obtained by Büscher et al [7] were obtained with a gas liner Z pinch of proton perturbers with T e 4 7.5 eV, which confirm the previous observations of Gawron et al [19]. The plasma parameters in these experiments were determined independently of the spectroscopy through Thompson scattering.…”

supporting

confidence: 74%

Accuracy of Stark Broadening Calculations for Ionic Emitters

Godbert‐Mouret¹,

Meftah²,

Calisti³

et al. 1998

Phys. Rev. Lett.

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The standard static-ion impact electron theory of line broadening is assessed with a calculation of the He II P a line over a broad range of plasma conditions. Ion dynamics, an improved electron collision operator, and accurate atomic physics are included in the computation. Simulations also have been performed to validate effects included in the calculation at higher densities. Calculated linewidths are compared with experiment over more than two decades in electron density, and broad agreement is found. This provides the first critical evaluation of the assumptions of Stark broadening theory. The profiles also display the first unambiguous evidence of ion dynamics. [S0031-9007(98)07936-8] PACS numbers: 52.70. Kz, 32.70.Jz, Stark-broadened line-shape calculations based on the standard static-ion impact-electron theory historically have been used to support the diagnostics of thermal plasmas [1]. In the following, the limits of validity of this theory will be assessed through a line profile computation of the He II Paschen-a (n 4 to 3) transition in a broad range of plasma conditions. The large number of effects involved in the calculation, the wide range of plasma parameters, and the extensive experimental line-shape data available suggest that P a is the appropriate test bed for these Stark broadening calculations. Moreover, benchmark simulations covering the plasma conditions are also available for comparison. The extensive range of available experimental data spans regions in the plasma parameter space for which almost all of the physical effects that can contribute to the line profile become important. These include the interference terms in the electronic collision operator, ion microfield fluctuations, and fine structure and detailed level splitting. Calculations of the atomic parameters of this transition are accessible, but not trivial, so that errors arising from the atomic physics are minimized, and attention can be focused on the line profile computation itself. All of the effects included in this computation have been studied singly or in combination in previous line shape calculations that were restricted to a smaller range of plasma parameters. The present work derives important new information from the range of plasma conditions covered and from the completeness of effects important for the standard Stark-broadening theory of ionic line profiles. It is for these reasons that the present calculations can be used to assess the accuracy of the standard model.The results presented here are based on calculations performed with PPP [2], a code that has been shown to produce rapid and accurate profiles of spectral lines emitted by multicharged ions in hot dense plasmas that are in excellent agreement with experimental data [3,4].It constitutes an important advance in the computation of Stark-broadened line shapes for the diagnostic of high density and temperature plasmas [5] such as those produced by lasers or pinches [6]. The calculated P a line profiles are compared with recent high density plasma expe...

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supporting

confidence: 74%

Accuracy of Stark Broadening Calculations for Ionic Emitters

Godbert‐Mouret¹,

Meftah²,

Calisti³

et al. 1998

Phys. Rev. Lett.

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“…The electron density and temperature at the axis of the plasma were measured by 90' Thomson scattering [22]. The contributions of the test ions to the scattering spectrum were taken into account by fitting theoretical spectra of Ref.…”

Section: Ii-experimentsmentioning

confidence: 99%

Investigation ofLScoupling in boronlike ions

et al. 1994

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In order to test the validity of the LS-coupling approximation for light elements, the line-intensity ratios of the 38-3p and 3p-3d multiplets in C II through F v and C II through Ne vj. , respectively, have been investigated experimentally with emission sources. Also, calculations with multicon6guration Dirac-Fock wave functions have been performed. Within the errors of the experimental procedure, no signi6cant violations of the LS-coupling approximation were found for the lines of the 3s-3p and 3p-3d multiplets in CII through F V. However, in the case of Nevi, small deviations of measured intensities from those obtained by applying the LS-coupling approximation were observed.PACS number(s): 32. VO.Fw, 32.30.Jc, 31.20.Tz, 32.70.Cs

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“…Electron densities and ion temperatures at the center of the plasma were determined by 90' Thomson scattering [19]. The evaluation procedure was improved by taking into account effects on the scattering spectra caused by the impurity ions [20]; details are discussed by De-Silva ef al.…”

Section: Plasma Diagnosticsmentioning

confidence: 99%

Stark broadening of spectral lines along the isoelectronic sequence of Li

1992

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Experimental Stark widths of the 3s S -3p P transitions in the Li-like ions Crv, Nv, Om, and NevIII are reported. The measurements were performed for a set of plasma parameters so that the density and temperature behavior of the Stark widths could be observed and compared with calculations. The experimental results did not show a scaling with Z, where Z is the spectroscopic charge number, which is expected from theoretical calculations in the electron-impact approximation.Furthermore, deviations from linear scaling appear for Z = 8. PACS number(s): 52.70.Kz, 32.70.Jz

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He iiPαStark broadening and intensity ratio of C iv and C iii lines calibrated with Thomson scattering for high-density plasma diagnostics

Cited by 30 publications

References 21 publications

Accuracy of Stark Broadening Calculations for Ionic Emitters

Accuracy of Stark Broadening Calculations for Ionic Emitters

Investigation ofLScoupling in boronlike ions

Stark broadening of spectral lines along the isoelectronic sequence of Li

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