The spatial distribution of the temperatures and the emitted spectrum in the electrolyte cathode atmospheric glow discharge

In an electrolyte cathode atmospheric glow discharge (ELCAD), the gas temperature (T-gas) obtained from the intensity ratio of the OH 306-309 nm unresolved rotational band heads and the electron temperature (T-el) received from the intensity ratio of the CuI 510.5 and 515.3 nm were investigated. In the near anode region, T-gas approximate to T-el approximate to 6000 K; in the positive column, Tgas 4000 K, T-el approximate to 5500 K; in the near cathode region, T-gas approximate to 8000 K, Tel 7500 K were found. These temperatures agree with our earlier results and are in accordance with the literature; that is, at atmospheric pressure, the gas and the electron temperatures approximate well with each other. The spatial intensity distribution of the atomic lines of metals dissolved in the electrolyte was measured and the intensity maximum occurred in the negative glow due to the high electron temperature and thus to the high excitation rate of this region.