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论文类型：期刊论文

发表时间：2016-01-01

发表刊物：PLASMA SCIENCE & TECHNOLOGY

收录刊物：SCIE、EI、Scopus

卷号：18

期号：1

页面范围：79-85

ISSN号：1009-0630

关键字：dielectric barrier discharge; discharging characteristic; optical emission spectra; Boltzmann plot method

摘要：In this paper, nitrogen dielectric barrier discharge (DBD) plasma was generated in a quartz tube with coaxial wire-cylinder electrodes at atmospheric pressure. By varying the nitrogen gas flow (F-N) in the range of 0-1 m(3)/h, the plasma optical emission spectra (OES) were measured and studied. The vibration (T-vib) and rotation temperature (T-rot) of nitrogen were obtained, by fitting the rovibronic bands of N-2 (C-3 Pi(u) - B-3 Pi(g), 0-1), and by the Boltzmann plot method for purposes of comparison. T-vib increased up to 2481 K with increasing nitrogen flow till 0.2 m(3)/h, and then decreased with further increasing F-N, while T-rot decreased monotonously and approached to, similar to 350 K for F-N >= 0.6 m(3)/h. The intensity of N-2 (C-3 Pi(u)-B-3 Pi(g), 0-0, 1-0, 0-3) and N-2(+)(B-2 Sigma(+)(u) - X-2 Sigma(+)(g), 0-0) exhibited similar evolution with increasing F-N to those of the T-vib and Trot, respectively. The discharge photos revealed that the discharge filaments gradually decreased with increasing F-N and eventually disappeared, which implied that a discharge mode transition emerged with increasing F-N. The possible mechanism for the discharge mode transition is studied in detail according to the vibration (T-vib) and rotation temperature (T-rot) of nitrogen.