Investigations of DC corona and back discharge characteristics in various gases

Jaworek, A.; Sobczyk, Arkadiusz; Rajch, E.

doi:10.1088/1742-6596/142/1/012010

Cited by 13 publications

(6 citation statements)

References 4 publications

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“…[38][39][40] The mechanistic reasons for the occurrence of back discharge have been well described in previous reports. 37,41,42 Briefly, when a dielectric layer with high resistivity covers an electrode, charge from the electrode accumulates on the dielectric surface. Discharge then ensues when the potential reaches a certain threshold.…”

Section: Resultsmentioning

confidence: 99%

“…This kind of discharge can cause problems during the manufacturing process; thus, it has been investigated in several studies 38–40 . The mechanistic reasons for the occurrence of back discharge have been well described in previous reports 37,41,42 . Briefly, when a dielectric layer with high resistivity covers an electrode, charge from the electrode accumulates on the dielectric surface.…”

Section: Resultsmentioning

confidence: 99%

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Mechanism behind the paper spray chemical ionization phenomenon and the choice of solvent

et al. 2020

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Paper spray chemical ionization (PSCI) combined with mass spectrometry has been proposed as a sensitive method for the analysis of nonpolar aromatic compounds; however, the mechanism behind PSCI is not well understood. In the present study, the evidence for the occurrence of corona discharge is provided and its mechanism is proposed. Photographs taken with a highly sensitive camera evidently demonstrate the occurrence of corona discharge at the end of the triangular shape tip when a nonpolar solvent such as hexane was used at an applied potential of 6-7 kV.Nevertheless, corona discharge was not observed in the presence of a polar solvent.The occurrence of the corona discharge was attributed to charge accumulation in the dielectric layer generated by the nonpolar solvent on the fibers of the paper tip. Specifically, corona discharge was generated at the tip end when the charge approached a critical threshold. In the presence of a polar solvent, however, the dielectric layer was not generated and, hence, corona discharge was not observed. Based on this information, three nonpolar solvents were selected and their sensitivity for analyzing the phenanthrene and maltene fractions of crude oil was evaluated. Chlorobenzene provided the highest signal abundance; therefore, it was suggested as the optimum solvent for PSCI. Notably, the fundamental understanding of corona discharge in PSCI acquired in this study provides a basis for further improvement of this technique by way of surface modification.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

Mechanism behind the paper spray chemical ionization phenomenon and the choice of solvent

et al. 2020

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“…It is well know that in pure N 2 , the spectrum of discharge is dominated by the second positive system of N 2 , and weaker first negative system of N + 2 [5,6,11,12,24,25]. Non-thermal plasma generated by electrical discharge at atmospheric pressure produces electrons and ions, which can be accelerated in electric field to high kinetic energy.…”

Section: Light Emission Spectramentioning

confidence: 99%

“…Non-elastic collisions between energetic electrons and gaseous molecules will produce chemically active species. In electric discharge in CO 2 at atmospheric pressure, the spectrum is more complex because many overlapping bands of CO 2 , CO and C 2 systems are generated due to non elastic collisions between energetic electrons and CO 2 molecules [5,6,17]. Although the emission of CO 2 molecules cannot be observed in the investigated spectral range (because main emission lines are in the infrared range), the existence of CO 2 may be detected indirectly, e.g.…”

Section: Light Emission Spectramentioning

confidence: 99%

“…Previously, optical emission spectroscopy has been used for the analysis of electrical discharge plasma in various gases by different discharge conditions, and for various types of discharges: pulsed corona discharge, microwave discharge, glow discharge or dielectric barrier discharge [4][5][6][7][8][9][10]. The experimental studies of CO 2 and N 2 dissociation in RF plasma torch at low pressure was investigated by Rond et al [11] and Su et al [12].…”

Section: Introductionmentioning

confidence: 99%

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Light emission spectra of molecules in negative and positive back discharges in nitrogen with carbon dioxide mixture at atmospheric pressure

2015

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Abstract.Results of spectroscopic investigations and current-voltage characteristics of back discharge generated in point-plane electrode geometry with plate covered fly ash layer in a mixture of N2 + CO2 at atmospheric pressure, for positive and negative polarity of the discharge electrode are presented in this paper. Point-plane electrode configuration was chosen in these studies in order to simulate the physical processes occurring in electrostatic precipitator. Three forms of back discharge for both polarities were investigated: glow, streamers and low-current back-arc. Diatomic reactions and dissociation products of N2 and CO2 (OH, NO, CN), atoms from fly ash layer (N, Ti, Na), free radicals, molecules or ions, which have unpaired valence electrons, and other active species, e.g., N2 (in C,B,A-state), N + 2 (B) were identified in the discharges by the method of optical emission spectroscopy (OES). The measurements shown that atomic and molecular optical emission spectral lines from back discharge depend on the forms of discharge and the discharge current. In normal electrical discharges, the emission spectra are dominated by gaseous components, but in the case of back discharge, atomic lines belonging to chemical compounds of fly ash were also recorded and identified.

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