We investigated the characteristics of atmospheric pressure (AP) air glow discharge with aqueous electrolyte cathode. Distilled water or aqueous solutions of HNO 3 , KCl, KBr and KI were utilized as a cathode. The cathode voltage drop, electric field strength, gas temperature as well as emission intensity of some lines of OI, H, K, Na and bands of N 2 , OH, NO were measured at discharge current from 10 to 50 mA. The procedure of gas temperature measurement on the base of non-resolved structure of N 2 (C 3 u → B 3 g ) bands was described. The reduced electric field strength (E/N) was obtained, which showed that the discharge existed in the normal mode. On the base of these data, the regularities of optical emission were discussed.KEY WORDS: Atmospheric pressure plasma with aqueous electrolyte cathode; emission spectrometry; gas temperature.
Three types of the underwater discharges produced by means of AC voltage sources (500-2000 V, 0.05-1 A) were investigated. Dynamic volt-ampere characteristics and radiation intensity of these discharges were measured. It was observed the optical afterglow time up to 0.1-0.2 s. The information about their chemical action was got by stimulation of the oxidation of the organic and inorganic substances. It was found that the treatment of the cellulose and the flax by means of the underwater discharges results in the change of their molecular mass, lignin contain and surface concentration of the oxygen containing functional groups.
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