Collision of Two Plasma Diffuse Jets with the Same and Opposite Front Polarities at Air Pressure of 1 Torr

• Published in: Plasma physics reports Vol. 50; no. 1; pp. 153 - 162
• Main Authors: Tarasenko, V. F., Vinogradov, N. P., Baksht, E. Kh, Pechenitsyn, D. S.
• Format: Journal Article
• Language: English
• Published: Moscow Pleiades Publishing 2024; Springer Nature B.V
• Subjects: Atomic; Low-Temperature Plasma; Molecular; Nitrogen; Optical and Plasma Physics; Physics; Physics and Astronomy; Radiation; Radiation spectra; Voltage pulses; plasma diffuse jets; low-pressure air; capacitive discharge; streamer collision
• ISSN: 1063-780X; 1562-6938
• DOI: 10.1134/S1063780X23601736

In air at a pressure of 1 Torr, the regime of collision of plasma diffuse jets (PDJ) that consist of red streamers was studied. The PDJ were formed by sending voltage pulses at a frequency of 21 kHz in a quartz tube, and they started from the plasma of a capacitive discharge that was created by the voltage pulses of positive and negative polarity. It is shown that when the pulse polarity is the same, the opposite PDJs in air suppress each other’s radiation from the 2+ and 1+ systems of molecular nitrogen. It is also shown that at the opposite polarity of the voltage pulses, the intensity of radiation in the PDJ collision region increases substantially. The data is provided on the effect of the delay between the switching on of the generators of opposite polarity on the PDJ radiation spectra. It is shown that, when the relative air humidity is increased, lines of atomic nitrogen H α appear in the spectrum as well as the hydroxyl molecular bands OH and OH + , whose spectral radiation energy density is commensurate with the energy density of the second positive (2+) system of molecular nitrogen.