Measurements of electron density and Stark width of neutral helium lines in a helium arc plasma |
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| Authors: | H M Gao S L Ma C M Xu L Wu |
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| Institution: | (1) State Key Laboratory of Advanced Welding Production Technology, Harbin Institute of Technology, Harbin, 150001, P.R. China |
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| Abstract: | 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 ?, 5016 ?, and 6678 ? 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 ? and 7065 ? are determined based on the measurements
and compared with existing data. |
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| Keywords: | 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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