Line Broadening Measurement in High Density Plasma I. H<sub>α</sub> and H<sub>β</sub>

Okasaka, Rei; Nagashima, Michiyoshi; Fukuda, Kuniya

doi:10.1143/jpsj.42.1339

Cited by 10 publications

(5 citation statements)

References 20 publications

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“…Including ion motion in the MMM calculation, this effect is compensated at least for the temperatures covered here, and the half width is essentially constant. Col lecting the relevant data of three different experi ments seems to verify this prediction: At 104 K WKH 9 find a half width slightly smaller than that predicted by KGn , HG12 report good agreement with the KG value at about 2 -104 K, and in another recent measurement of Okasaka et al 30, a half width distinctly greater than that of KG has been observed at 3 • 104 K.…”

Section: Theoretical Resultssupporting

confidence: 54%

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Effects of Ion Motion on Hydrogen Stark Profiles

Seidel

1977

Zeitschrift Für Naturforschung A

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The influence of ion motion on Stark broadened hydrogen lines is studied using the Method of Model Microfields which allows a uniform unified treatment of electrons and ions. Contrary to former theoretical investigations, strong effects are found in the line centres of L-a, H-a, and H-ß which agree well with recent experimental findings, especially those of Wiese, Kelleher, and Helbig. E ffects o f I o n M o tio n o n H y d r o g e n S ta rk P ro files For the Stark broadening of hydrogen lines the unified theory developed by Voslamber 1 and Smith et al.2 provides a refined description of line profiles including the transition region from the "static" wing to the "impact" centre. Evaluating the results of the unified theory, Vidal, Cooper, and Smith3 (VCS) have compiled extensive tables of Stark pro files of low Lyman and Balmer lines which greatly facilitate the comparison to experimental results. A detailed experimental investigation of the Stark broadening of Balmer lines has been carried through by Wiese, Kelleher, and Paquette 4 (WKP) who give a short account as well of former measurements which have been done in the same range of plasma densities and temperatures (typical values are Ne = 1017 cm-3, T = 104 K ). As a general result, good agreement between theory and experiment is found in the line wings but the measured profiles exhibit much less structure in their central portions than those of VCS. A similar finding has been reported 5 for low electron densities, too, and the conclusion seems to be inevitable that not all the approxima tions used in the VCS calculations work as good in ithe line centre as has been estimated.Possible candidates are especially the neglect of time ordering in the evaluation of the effects of radiator-perturber collisions, and the assumption of a static ion microfield. The first of these is not a constituent part of the unified theory but may be removed at the expenditure of greater calculational efforts. Corresponding results of Roszman6 indicate that the inclusion of time ordering improves the agreement of experiment and theory, but certainly is not sufficient to remove the discrepancies. This has been made most obvious by a recent experiment Reprint requests to Dr. J. Seidel, Institut für Theoretische Physik der Universität Düsseldorf, Universitätsstraße 1, D-4000 Düsseldorf.of Grützmacher and Wende 7 who succeeded to mea sure the line centre of L-a for the first time. While they report a half width of more than twice the theoretical value, its increase by the consideration of time ordering in the VCS calculations 8 amounts to only 14%. This points out to an influence of ion dynamics much stronger than has been expected, and indeed there is convincing experimental support of this conjecture: Precision measurements of Wiese, Kelleher, and Helbig9 (WKH) revealed distinctly different line centres for various values of the ra diating atom-perturbing ion reduced mass /u. More over, these authors found that an extrapolation to jU = oc, based upon the assumption of a linear de pe...

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Section: Theoretical Resultssupporting

confidence: 54%

“…A more recent experi ment by Okasaka et al 30 shows that an extrapolation to higher densities of the WKH data is possible, and the HG experiment12 yielded similar results, too. Therefore the experimental findings seem to be defi nite.…”

Section: Comparison With Experimental Datamentioning

confidence: 74%

Effects of Ion Motion on Hydrogen Stark Profiles

Seidel

1977

Zeitschrift Für Naturforschung A

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“…The peak asymmetry was analyzed for H β . The authors discussed and compared values of contributions of various mechanisms in formation of studied characteristics and claimed a good agreement with experimental measurements [36,42,46,49,56,60]. As was noted by the authors, the inclusion of ion dynamics with the help of MMM decreased the absolute values of the profile asymmetry.…”

Section: Plasma Of Gas Dischargesupporting

confidence: 64%

Beyond the Linear Stark Effect: A Retrospective

Demura

2018

Atoms

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“…According to the formalism described above, the intensities I and the wavelengths 2 of these points and the asymmetry parameters The measured values are taken from [9] ([]), [22] (v), [23] (I), [24] (+), [25] (x), [26] (...), [27] (zx), [28] (o), [29] (A), [30] (e) measurements is good. This was an encouragement for calculating the whole profile P(Aog).…”

Section: Comparison With Measurements Of H~ Line and Conclusionmentioning

confidence: 99%

Asymmetry of hydrogen lines in plasmas utilizing a statistical description of ion-quadruple interaction in Mozer-Baranger limit

Halenka

1990

Z Phys D - Atoms, Molecules and Clusters

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Line Broadening Measurement in High Density Plasma I. H_α and H_β

Cited by 10 publications

References 20 publications

Effects of Ion Motion on Hydrogen Stark Profiles

Effects of Ion Motion on Hydrogen Stark Profiles

Beyond the Linear Stark Effect: A Retrospective

Asymmetry of hydrogen lines in plasmas utilizing a statistical description of ion-quadruple interaction in Mozer-Baranger limit

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Line Broadening Measurement in High Density Plasma I. Hα and Hβ

Cited by 10 publications

References 20 publications

Effects of Ion Motion on Hydrogen Stark Profiles

Effects of Ion Motion on Hydrogen Stark Profiles

Beyond the Linear Stark Effect: A Retrospective

Asymmetry of hydrogen lines in plasmas utilizing a statistical description of ion-quadruple interaction in Mozer-Baranger limit

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Product

Resources

About

Line Broadening Measurement in High Density Plasma I. H_α and H_β