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Revisiting the Stark Width and Shift of He II Pα

Faculty of Physics, Weizmann Institute of Science, Rehovot 7610001, Israel
Institute of Applied Physics and Computational Mathematics, Beijing 100088, China
Departamento de Óptica, Universidad de Valladolid, 47071 Valladolid, Spain
Lawrence Livermore National Laboratories, P.O. Box 808, Livermore, CA 94550, USA
Aix Marseille Université, CNRS, PIIM UMR 7345, 13397 Marseille, France
Author to whom correspondence should be addressed.
Atoms 2018, 6(2), 23;
Received: 1 March 2018 / Revised: 28 March 2018 / Accepted: 18 April 2018 / Published: 24 April 2018
(This article belongs to the Special Issue Spectral Line Shapes in Plasmas II)
PDF [1554 KB, uploaded 24 April 2018]


We report experimental determination of plasma-induced Stark widths and shifts of the He II P α line and a comparison of the results with calculations performed by several computational approaches. The measurements were carried out in a small compressing plasma channel device, reaching electron densities in excess of 10 18 cm 3 and temperatures of a few eV. The experimental data are in a good agreement with some previously published studies. However, the measured relation between the Stark shift and width could not be reproduced by either of the codes, and this disagreement is not yet resolved. This suggests the existence of an additional effect that is not accounted for in the present models and leads to a larger than expected Stark shift of the He II P α line. View Full-Text
Keywords: Stark width and shift; helium Paschen-α; lineshape code comparison; plasma density diagnostics Stark width and shift; helium Paschen-α; lineshape code comparison; plasma density diagnostics

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Stollberg, C.; Stambulchik, E.; Duan, B.; Gigosos, M.A.; González Herrero, D.; Iglesias, C.A.; Mossé, C. Revisiting the Stark Width and Shift of He II Pα. Atoms 2018, 6, 23.

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