PMID: 18422111Apr 22, 2008Paper

Influence of pressure on plasma temperature in air/argon dielecteic barrier discharge

Guang pu xue yu guang pu fen xi = Guang pu
Li-fang DongXue-chen Li

Abstract

Electron excitation temperature and molecule vibrational temperature in argon/air dielectric barrier discharge (DBD) at different gas pressure with water electrodes were studied by using optical emission spectra. The spectral lines of Ar I 763. 51 nm(2P6 --> 1S5) and Ar I 772.42 nm(2P2 --> 1S3) were chosen to calculate electron excitation temperature by the relative intensity ratio method. The emission spectra of nitrogen band of second positive system ( C3 pi(u) --> B3 pi(g)) were measured at the same time. The molecule vibration temperature was estimated by the emission intensities of different bands with delta(nu) = -1, delta(nu) = -2, and delta(nU) = -3 in nitrogen band of second positive system, using Boltzmann's plot method. In addition, the relative line intensities of nitrogen (0-0) band of first negative system at 391.4 nm and (0-0) band of second positive system at 337.1 nm were also measured to study the variation of electron energy. It was found that the electron excitation temperature decreased from 4 700 to 3 300 K and the molecule vibrational temperature decreased from 3 200 to 2 900 K with increasing gas pressure from 20 to 60 kPa. Besides, the ratio of I(N2+)/I(N2) also decreased with pressure increasing from 2...Continue Reading

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