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An experimental investigation is performed of the electrical and spectral characteristics of plasma of an electrodeless neon light source operating on the principle of inductively coupled discharge. The investigations are performed under the optimal conditions of discharge burning (neon pressure of ~1 torr, current frequency of 250 kHz, and discharge current of 3 to 10 A) corresponding to the high efficiency of the light source (~20%). The spatial distribution of the radiation intensity of individual lines of neon is studied. Measurements are performed of discharge spectra at different points of the gas-discharge bulb and of the electrical characteristics of the discharge. The resultant experimental data are used to calculate and analyze the parameters of discharge plasma (the electron density and temperature and the concentration of excited atoms).

An experimental investigation of transformer-coupled discharge in an Ar-O2 mixture with the addition of SiCl4, TiCl4 and ZrCl4 has been carried out under the atmospheric pressure of plasma-forming gases. Discharge power and discharge heat losses have been determined, and the dispersion and phase composition of reaction products (oxide powders) has been analyzed with SEM and X-ray diffraction analysis. Investigations reveal the formation of ultrafine oxide powders in the case of vaporized chloride (SiCl4 and TiCl4) injecting into the transformer coupled discharge. In the case of fine powder (ZrCl4) injection, full oxidation was not observed and reaction products consisted of a mixture of ZrO2 and ZrOCl2. A conclusion has been made regarding the perspectives of using transformer-coupled discharge to produce ultrafine oxide powders.

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