Optical Emission Spectroscopy Diagnostics of Electron Density and Temperature for Atmospheric-Pressure Helium Plasma Based on a Collisional- Radiative Model
The conventional helium collisional-radiative (CR) model is updated by including atomic collision processes. An algorithm is developed to determine the electron density and temperature of atmospheric pressure helium plasma based on the revised CR model. It fits eight emission lines (3^1S, 3^3S, 3^1P, 3^3P, 3^1D, 3^3D, 4^1D, and 4^3D) in the visible-wavelength range by the electron density, electron temperature, ground state density, and the populations
of two metastable levels (3^1S and 3^3S). Electron density and temperature diagnosed by the algorithm agree well with the results measured with probe method at low-pressure. Results of the algorithm are also in good agreements with results of the continuum spectrum analysis at atmospheric pressure.
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