Physics – General Physics
Scientific paper
Jul 1976
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1976phrva..14..291n&link_type=abstract
Physical Review A - General Physics, 3rd Series, vol. 14, July 1976, p. 291-299. NASA-NSF-supported research.
Physics
General Physics
22
Frequency Shift, Helium Plasma, Lyman Spectra, Plasma Spectra, Polarized Electromagnetic Radiation, Stark Effect, Electron Density (Concentration), Plasma Temperature, Spectral Line Width
Scientific paper
Stark broadening and shift measurements were performed on ionized helium resonance lines from a fully ionized helium plasma in a low-inductance electromagnetic T tube. Both time-integrated photographic and time-resolved photoelectric measurements of the lines were performed with a grazing incidence spectrometer. Electron density and temperature were determined from the widths of the He II 4686-A and the He I 5876-A lines and the He II 4686-A line to continuum ratio, respectively. It was found that all ionized helium resonance lines were emitted optically thick by a homogeneous plasma slab and self-reversed by a thin cooler boundary layer. Marked blue shifts of 0.07 plus or minus 0.05 A which may be due to plasma polarization were noted.
Griem Hans R.
Neiger M.
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