Contribution of ion to the astrophysical important 471.32 nm He I spectral line broadening

Details Contribution of ion to the astrophysical important 471.32 nm He I spectral line broadening Contribution of ion to the astrophysical important 471.32 nm He I spectral line broadening

Jul 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002pobeo..73..173m&link_type=abstract

Publications of the Astronomical Observatory of Belgrade (ISSN 0373-3742), No. 73, p. 173 - 179 (2002). In: Proceedings of the T

Astronomy and Astrophysics

Astrophysics

Spectral Lines, Helium, Line Broadening

Scientific paper

Ion contribution of the astrophysical important Stark broadened 471.32 nm He I spectral line profiles have been measured at electron densities between 4.4×1022 and 8.2×1022 m-3 and electron temperatures between 18000 and 33000K in plasmas created in five various discharge conditions using a linear, low-pressure, pulsed arc as an optically thin and reproductive plasma source operated in a helium-nitrogen-oxygen gas mixture. On the basis of the observed asymmetry of the line profiles we have obtained their ion broadening parameters (A) caused by influence of the ion microfield and also the influence of the ion dynamic effect (D) to the line shape. Our A and D parameters represent the first data obtained experimentally by the use of the line profile deconvolution procedure. We have found stronger influence of the ion contribution to this He I line profiles than the semiclassical theoretical approximation provides. This can be important for some astrophysical plasma modelling or diagnostics.

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