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Kinetics of metastable N2(A3Σu + , v) molecules in high-pressure nonequilibrium plasmas
Plasma Sources Science and Technology ( IF 3.3 ) Pub Date : 2021-03-04 , DOI: 10.1088/1361-6595/abcc7c
E R Jans 1 , S Raskar 1 , X Yang 2 , I V Adamovich 1
Affiliation  

Absolute, time-resolved populations of N2(A3Σu +, v = 0–5) vibrational levels in high-pressure ns pulse discharge plasmas are measured by Tunable Diode Laser Absorption Spectroscopy (TDLAS). The diffuse plasma is generated by a repetitively pulsed, double dielectric barrier, ns discharge across a 10mm gap in a plane-to-plane geometry, at pressures of up to 400 Torr. The results of TDLAS measurements in nitrogen and in H2–N2, O2–N2, and NO–N2 plasmas are compared with kinetic modeling predictions, identifying the mechanisms of N2(A3Σu +) generation and decay during the discharge pulses and in the afterglow. Comparison with the modeling predictions indicates that electron impact dissociation of N2 from the ground electronic state significantly underpredicts the yield of N atoms. The present data suggest that N2 dissociation in the plasma also occurs during the energy pooling process in collisions of two N2(A3Σu +) molecules. The results also show that high-pressure, high repetition rate, volume-scalable ns pulse discharges can be used for efficient generation of atomic species for plasma chemical and plasma catalysis syntheses. In an NO–N2 mixture, it is shown that the N2(A3Σu +) decay is controlled by the rapid energy transfer to NO, resulting in its electronic excitation and UV emission (NO γ bands). The diagnostics used in the present work can be used for the accurate characterization of both high-pressure, low-temperature gas discharge plasmas and high-temperature nonequilibrium flows generated in pulsed facilities such as shock tubes and expansion tunnels.



中文翻译:

的亚稳Ñ动力学2(A 3 Σ ü +,v)的高压非平衡等离子体分子

绝对的,N个时间分辨群2(A 3 Σ ü +v = 0-5)在高压ns脉冲,放电等离子体振动水平是由可调谐二极管激光吸收光谱学(TDLAS)测量。扩散等离子体是由重复脉冲的双介电势垒产生的,ns放电时在平面至平面几何形状中跨越10mm的间隙,压力最高为400 Torr。TDLAS测量在氮气和H中的结果2 -N 2,O- 2 -N 2,和NO-N 2个等离子体与动力学模型预测相比,确定n的机制2(A 3 Σ 在放电脉冲期间和余辉期间u +)的产生和衰减。与建模预测的比较表明,N 2与基态电子的电子碰撞解离显着地低估了N原子的产率。目前的数据表明N个2离解在等离子体中时两个N的碰撞能量池处理时,也会发生2(A 3 Σ Ù +)分子。结果还表明,高压,高重复率,体积可缩放的ns脉冲放电可用于高效生成原子种类,以进行等离子体化学和等离子体催化合成。在NO–N 2混合物中,表明N2(A 3 Σ Ù +)衰变通过快速能量转移到NO的控制,从而导致在其电子激发和发射UV(NOγ频带)。本工作中使用的诊断程序可用于对脉动设备(如激波管和膨胀隧道)中产生的高压,低温气体放电等离子体和高温非平衡流进行精确表征。

更新日期:2021-03-04
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