The electron temperature Te and density Ne of atmospheric-pressure non-equilibrium dielectric barrier discharge argon (Ar) plasma are measured with optical emission spectroscopy. Continuum emission due to bremsstrahlung is applied to the analysis of the electron temperature and density with the spectrometric system in the visible wavelength range calibrated absolutely. The assumption of the Maxwellian electron energy distribution function (EEDF) results in T_e ~ 0.29 eV and N_e ~ 1.1 × 10^{16} cm^{−3}, whereas the Druyvesteyn EEDF leads to the result T_e ~ 0.79 eV and N_e ~ 1.4 × 10^{14} cm^{−3}. To confirm the validity of these values, several line intensities of the excited states of the Ar atom are observed experimentally and compared with the theoretical population densities calculated by the Ar collisional–radiative (CR) model that includes atomic collisional processes. It is confirmed that the order of the observed excited-state number densities agrees well with that calculated numerically by the CR model with the Druyvesteyn EEDF, while the Maxwellian EEDF gives poor results.
受賞情報
The 20th Plasma Electronics Award, Selected as a "Spotlights" article, as "highlights 2021", 44th JSAP Outstanding Paper Award
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