Characteristics of Atmospheric Pressure Air Glow Discharge with Aqueous Electrolyte Cathode

Abstract

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.

Spectroscopic Characterization of Miniaturized Atmospheric-Pressure dc Glow Discharge Generated in Contact with Flowing Small Size Liquid Cathode

“…Similar rotational temperature determined from band of OH was also measured Nikiforov et al [26] by LIF and Webb et al [25] by optical emission spectroscopy (OES) techniques. The vibrational temperature and excitation temperature were consistent with the previous studies [12,22]. Throughout all experiments, the T rot (N 2 ) was considerably lower than the T rot (OH).…”

“…Usually the generation of the APGD between a solid anode and a liquid cathode requires application of a dc high voltage [10][11][12][13][14]. Stable APGDs with liquid electrodes have been generated by applying voltages between 0.4 and 1.8 kV and currents between 5 and 150 mA, over gaps ranging from 0.2 to 5 mm in the air atmosphere [7,15,17,18].…”

“…Recently, APGD plasmas with various liquid electrodes have been studied at different currents and distances from the liquid electrode [11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26], while the other plasma generation parameters were faintly investigated. Nevertheless, the phenomena of glow discharge generated at atmospheric pressure are still poorly understood.…”

“…Additionally, Bruggeman et al [11] found that rotational temperatures of N 2 and OH were identical and equal to 3,250 K in the anode glow region (positive column). The cathode voltage drop, the electric field strength, and the vibrational and rotational temperatures of N 2 were studied by Titov et al [12,13] as a function of discharge current (10-50 mA) for distilled water and for aqueous solutions of HNO 3 , KCl, KBr and KI. The plasma parameters, i.e., the vibrational and rotational temperatures of N 2 (*4,200 and *2,100 K, respectively), indicated that this atmospheric pressure glow discharge was a non-equilibrium system.…”

Physical Parameters and Chemical Composition of a Nitrogen DC Discharge with Water Cathode

“…Such data are rather limited. The emission spectra show usually the radiation bands of excited states of N 2 , OH and NO and lines of atomic H and O at discharge in nitrogen containing gases [4][5][6]. As far as the discharges in contact with water are concerned, there are some studies where the OH radical concentrations in the ground state were measured in a gas phase for the atmospheric pressure DC discharge in an ambient air, He, Ar and N 2 by a LIF method [6,7] and applying the absorption in UV region for Ar/H 2 O [8].…”