Stark-broadening of the helium lines 447 and 492 nm at low electron densities

Details Stark-broadening of the helium lines 447 and 492 nm at low electron densities Stark-broadening of the helium lines 447 and 492 nm at low electron densities

Jan 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991jqsrt..45...11a&link_type=abstract

Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073), vol. 45, Jan. 1991, p. 11-31.

Computer Science

4

Electron Density (Concentration), Helium, Line Spectra, Spectral Line Width, Stark Effect, Doppler Effect, Laser Interferometry, Unified Field Theory, Visible Spectrum

Scientific paper

Stark-broadening of quasi-degenerate He I lines at 447 and 492 nm has been investigated at low electron densities ranging from Ne = 1 x 10 to the 20th to 3 x 10 to the 21th/cu m. The electron density is determined by accurate laser interferometry with quadrature detection. Calculations have been performed according to the unified theory and the model microfield method. The line-profile measurements are compared with the calculations by a parameterization scheme. The influences of Doppler, ion-dynamical, and instrument broadening are critically discussed. Different line profile parameters are examined in view of their applicability for diagnostic purposes.

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