Plasma Shifts of Hydrogenic-Ion Lines

Pittman, T. L.; Voigt, P.; Kelleher, Daniel E.

doi:10.1103/physrevlett.45.723

Cited by 49 publications

(24 citation statements)

References 16 publications

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“…In this case there are not so many data points to compare with at least in the interval of electron densities considered, from 10 22 to 1.5 × 10 23 m −3 . In relation to other experimental measurements, very good agreement is found now with one datum from Pittman et al (1980) showing this result differences lower than 10% with ours, possibly the most optimistic estimation of uncertainty in this kind of measurement and experiment. Once more, comparisons with theoretical calculations reveal very good agreement between our data and those by Kepple (1972) and by Stehlé (1994) although differences with those by Griem et al (1962) are also lower than the 15% of the uncertainty estimated for our results.…”

Section: P β Resultssupporting

confidence: 90%

“…The influence of self-absorption found by these authors should be probably considered only for electron densities lower than 0.4 × 10 23 m −3 . Agreement is not so good with Piel (1984) or Pittman et al (1980), the differences with Bacon (1977) being around 50%. The latter calculated the electron density from the HeI 388.9 nm Stark halfwidth.…”

Section: P α Resultsmentioning

confidence: 82%

“…Stark widths, shifts, dips and functional dependencies of their line wings. In the case of P α and P β lines, great effort has been focused on obtaining accurate measurements of these quantities (Berg et al 1962;Eberhagen & Wunderlich 1970;Bogen 1970;Jones et al 1971;Einfeld & Sauerbrey 1976;Bacon et al 1977;Soltwisch & Kusch 1979;Oda & Kiriyama 1980;Bernard et al 1981;Piel & Slupek 1984;Ackermann et al 1985;Pittman et al 1980Pittman et al , 1986Gawron et al 1988;Glenzer et al 1992Glenzer et al , 1994Hammel et al 1993;Godbert et al 1994;Konjević et al 1995;Stefanović et al 1995;Büscher et al 1996;Wrubel et al 1997) Send offprint requests to: Dr. J. A.…”

Section: Introductionmentioning

confidence: 99%

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Measurement of Stark parameters of HeII P_\alpha, P_\betaand P_\gammaspectral lines

Rodrı́guez¹,

Aparicio²,

González³

et al. 2003

A&A

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Abstract. This work reports information on the pressure broadened profiles of the HeII P α , P β and P γ spectral lines measured in a pulsed discharge lamp. Information relative to the line shapes, full width at 1/2, 1/4 and 1/8 of the maximum intensity and the dip of the HeII 320.3 nm is provided. The electron density has been determined by two-wavelength interferometry and from the Stark width of the HeI 501.6 nm. and ranges during the HeII emission from 0.54 to 0.64 × 10 23 m −3 in the plasma. Temperature (1.7-2.4 eV) has been simultaneously determined from the Boltzmann-plot of HeI and from local thermodynamic equilibrium (LTE) assumptions. The final results have been compared with most of the previous existing data.

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Section: P β Resultssupporting

confidence: 90%

Section: P α Resultsmentioning

confidence: 82%

Section: Introductionmentioning

confidence: 99%

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Measurement of Stark parameters of HeII P_\alpha, P_\betaand P_\gammaspectral lines

Rodrı́guez¹,

Aparicio²,

González³

et al. 2003

A&A

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“…The calculated P a line profiles are compared with recent high density plasma experiments [7] and lower density data from previous measurements [8,9], covering more than a two-decade range of electron density N e with an associated 2 orders of magnitude change in the transition full width at half maximum (FWHM). The present calculations are seen to be in good overall agreement with experiment, except at the highest densities, where the discrepancy is a measure of the accuracy of the standard model.…”

mentioning

confidence: 99%

“…The plasma temperature varies between 34 000 and 87 000 K, and proton or He 1 perturbers are involved, depending on the particular experiment. The experiment of Pittman et al [8] was performed in a pure helium plasma with T e of the order of 4 eV. The data of Stefanovic et al [9] was acquired in a plasma with predominantly proton perturbers at T e 3.27 eV.…”

mentioning

confidence: 99%

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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Spectroscopic Plasma Diagnostics

Drawin

1983

Atomic and Molecular Physics of Controlled Thermonuclear Fusion

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Plasma Shifts of Hydrogenic-Ion Lines

Cited by 49 publications

References 16 publications

Measurement of Stark parameters of HeII P_\alpha, P_\betaand P_\gammaspectral lines

Measurement of Stark parameters of HeII P_\alpha, P_\betaand P_\gammaspectral lines

Accuracy of Stark Broadening Calculations for Ionic Emitters

Spectroscopic Plasma Diagnostics

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Plasma Shifts of Hydrogenic-Ion Lines

Cited by 49 publications

References 16 publications

Measurement of Stark parameters of HeII P\alpha, P\betaand P\gammaspectral lines

Measurement of Stark parameters of HeII P\alpha, P\betaand P\gammaspectral lines

Accuracy of Stark Broadening Calculations for Ionic Emitters

Spectroscopic Plasma Diagnostics

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Product

Resources

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Measurement of Stark parameters of HeII P_\alpha, P_\betaand P_\gammaspectral lines

Measurement of Stark parameters of HeII P_\alpha, P_\betaand P_\gammaspectral lines