Ion contribution to the astrophysical important 388.86, 471.32 and 501.56 nm He I spectral lines broadening

Details Ion contribution to the astrophysical important 388.86, 471.32 and 501.56 nm He I spectral lines broadening Ion contribution to the astrophysical important 388.86, 471.32 and 501.56 nm He I spectral lines broadening

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002newa....7..543m&link_type=abstract

New Astronomy, Volume 7, Issue 8, p. 543-551.

Astronomy and Astrophysics

Astronomy

11

Scientific paper

Characteristics of the astrophysical important Stark broadened 388.86 nm, 471.32 nm and 501.56 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 18,000 and 33,000 K 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 these He I line profiles than the semiclassical theoretical approximation provides. This can be important for some astrophysical plasma modelling or for diagnostics.

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