EDP Sciences
Free access
Volume 398, Number 3, February II 2003
Page(s) 1179 - 1184
Section Celestial mechanics and astrometry
DOI http://dx.doi.org/10.1051/0004-6361:20021654

A&A 398, 1179-1184 (2003)
DOI: 10.1051/0004-6361:20021654

Ion contribution to the prominent Ne I, Ar I and Kr I spectral line broadening

V. Milosavljevic1, 2 and S. Djenize1, 2, 3

1  Faculty of Physics, University of Belgrade, PO Box 368, Belgrade, Serbia, Yugoslavia
2  Isaac Newton Institute of Chile, Yugoslavia Branch, Belgrade, Yugoslavia
3  Hungarian Academy of Sciences, Budapest, Hungary

(Received 23 August 2002 / Accepted 16 October 2002 )

On the basis of the observed asymmetry of the measured spectral line profiles we have obtained the ion contribution to the $\ion{Ne}{i}$ (26 lines), $\ion{Ar}{i}$ (19 lines) and $\ion{Kr}{i}$ (20 lines) spectral line broadening due to the quasi-static ion approximation and ion-dynamical effects. The ion broadening parameters ( A) and the ion dynamic coefficients ( D) have been obtained directly by the use of our line deconvolution procedure which allows the determination of the basic physical properties that characterize the line profile and also the relevant plasma parameters. We are the first to publish experimental data, viz. D and A values for the $\ion{Ne}{i}$, $\ion{Ar}{i}$ and $\ion{Kr}{i}$ lines. The 26 $\ion{Ne}{i}$, 6 $\ion{Ar}{i}$ and 9 $\ion{Kr}{i}$ A values are the first measured data and many of them are the first published data in this field. We have found clear evidence of the quasi-static ion and ion-dynamical effects on the investigated line shapes; they play a much more important role than the approaches based on semiclassical theory provide, especially in the case of the $\ion{Ne}{i}$ spectral lines. This is of importance for astrophysical plasma modeling and diagnostics.

Key words: plasmas -- line: profiles -- atomic data

Offprint request: V. Milosavljevic, vladimir@ff.bg.ac.yu

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