强激光与粒子束, 2016, 28 (3): 035001, 网络出版: 2016-03-28  

重复频率脉冲大气放电中氮气的振动温度

Nitrogen vibrational temperature in repetitively pulsed air discharges
作者单位
北京应用物理与计算数学研究所,北京 100094
摘要
氮气分子的振动自由度在大气放电低温等离子体中会被高度激发。从振动能级的简谐振子模型和Boltzmann分布近似出发,研究重复频率脉冲放电中振动温度的变化行为。结果表明,决定重频条件下振动温度的主要过程是电子碰撞振动激发和振动-平动弛豫,而在振动能级高度激发的情形下其与氧原子的化学反应也会产生影响。对于振动激发过程,通过跃迁反比相似率推导出的特征弛豫时间与动理学模型符合较好。在振动-平动弛豫中占主导贡献的为干燥大气中的氧原子或潮湿大气中的水分子。当氧原子数密度为1014 cm-3时,若初始振动温度在5000 K,在化学反应过程中振动能量的特征弛豫时间在0.1~1 s量级。
Abstract
The vibrational degree of nitrogen is highly excited in low temperature plasma generated by air discharges. Based on harmonic oscillator model and the assumption of Boltzmann distribution of vibrational levels, the behavior of vibrational temperature during repetitively pulsed air discharges is investigated. The results show that the determinant factor of vibrational temperature is the competition between electron-vibrational (e-V) excitation process and vibrational-translational (V-T) relaxation process, while the chemical-vibrational (Chem-V) process involving oxygen atom also influences in highly excited vibrational state. For the e-V process, the characteristic relaxation time deduced from an empirical reciprocal law of transition rates agrees well with that from kinetic modeling. For the V-T process, the dominant role is played by oxygen atoms in dry air and water moleculars in humid air. If the density of oxygen atom is 1014 cm-3 and the vibrational temperature is 5000 K, the relaxation time during initial Chem-V process is in the order of 0.1~1 s.

杨薇, 董志伟, 周前红. 重复频率脉冲大气放电中氮气的振动温度[J]. 强激光与粒子束, 2016, 28(3): 035001. Yang Wei, Dong Zhiwei, Zhou Qianhong. Nitrogen vibrational temperature in repetitively pulsed air discharges[J]. High Power Laser and Particle Beams, 2016, 28(3): 035001.

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