常压介质阻挡放电氧气大气谱带分析

Analysis of Oxygen Atmospheric Band in Dielectric Barrier Discharge at Atmospheric Pressure

观测了氧气常压介质阻挡放电过程产生的发射光谱,利用氧气大气谱带(b1Σg+→X3Σg-)转动结构的拟合光谱与实验光谱的比较和氧原子发射谱线测量了等离子体的气体温度和电子温度;通过分析氧气常见激发态(a1Δg,b1Σg+和A3Σg+)的产生和猝灭途径,结合氧气激发、解离过程的动力学数据,探讨了在大气压介质阻挡放电条件下氧气大气谱带的产生原因。结果表明:在该实验条件下氧气常压介质阻挡放电时电子温度(11800±400)K远高于气体温度(650±20)K,由于a1Δg的辐射跃迁概率太小,且A3Σg+在高气压下很容易被猝灭,实验中没有观测到这两个激发态的辐射,而测到了具有清晰转动结构的氧气大气谱带。

The emission spectra of pure oxygen in dielectric barrier discharge at atmospheric pressure were observed. Comparison between experimental and fitting spectra of oxygen A band （b1Σg＋→X3Σg-）（0, 0）was used to determine the gas temperature, and the electronic temperature was calculated from O I lines. The causation of oxygen A band in atmospheric dielectric barrier discharge was discussed by means of analysis of producing and quenching approaches. The result showed that the electronic temperature, （11800±400）K, was much higher than the gas temperature, （650±20）K. The emission from a a1Δg or A3Σg was not been observed, but atmospheric band with its resoluhle rotational structure was measured.