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Measurements of the neutral helium line widths were made in a high pressure electric shock tube plasma of electron density ~ 1 X 10  17 cm -3  and temperature ~ 1.5 eV. The measured half-widths are in ~10% agreement with the calculated widths based on GBKO theory. Electron densities were independently determined using a He-Ne laser interferometer. A factor ~ 1.7 discrepancy between measured and calculated Stark widths (or electron densities) reported by Kusch and recently by Einfeld and Sauerbrey could not be confirmed.

Electron Den sities from Stark Widths of the HeI 5016 Å and HeI 3889 Å Lines and Helium - Neon Laser Interferometry