Electron densities in an atmospheric helium arc plasma have been measured with the Stark broadening parameters of helium spectral lines. The spatially distributed radiation intensities are converted to plasma emission coefficients at every wavelength by means of Abel inversion. From the inverted profiles of He I lines of 4713 Å, 5016 Å, and 6678 Å electron density has been calculated, which ranges from 0.5 ×1016 to 4 ×1016 cm-3 for a helium arc with current 200 A. Stark widths of He I lines of 3889 Å and 7065 Å are determined based on the measurements and compared with existing data.
52.70.-m Plasma diagnostic techniques and instrumentation 52.70.Kz Optical (ultraviolet, visible, infrared) measurements 32.70.Jz Line shapes, widths, and shifts
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