Argon metastable dynamics in a filamentary jet micro-discharge at atmospheric pressure
Argon metastable dynamics in a filamentary jet micro-discharge at atmospheric pressure
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DOI：
10.1088/0963-0252/21/3/034002
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发表时间：
2011-09
影响因子：
3.8
通讯作者：
B. Niermann;R. Reuter;T. Kuschel;J. Benedikt;M. Böke;J. Winter
中科院分区：
文献类型：
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作者：
B. Niermann;R. Reuter;T. Kuschel;J. Benedikt;M. Böke;J. Winter
利用可调谐二极管激光吸收光谱技术对大气压射频微等离子体射流出口处的Ar（3P2）亚稳原子进行了空间和时间分辨测量。放电的特点是一个同轴的几何形状与一个中空的毛细管作为内电极和一个陶瓷管与金属环作为外电极。亚稳态原子的吸收光谱和光发射测量揭示了放电的动力学和结构。观察到直径为125 µm的单丝，亚稳态密度约为1013 cm−3。的平均空间分布的Ar可膨胀的特征在于与和没有目标在前面的射流，显示出的目标电位，从而，电场分布基本上改变灯丝的膨胀。结合对点火阶段和脉冲放电行为的详细分析，给出了激励和去激励机制的分析结果。
Space- and time-resolved measurements of Ar (3P2) metastable atoms at the exit of an atmospheric pressure radio-frequency micro-plasma jet are performed using tunable diode laser absorption spectroscopy. The discharge features a coaxial geometry with a hollow capillary as the inner electrode and a ceramic tube with a metal ring as the outer electrode. Absorption profiles of metastable atoms and optical emission measurements reveal the dynamics and the filamentary structure of the discharge. Single filaments with a diameter of 125 µm and metastable densities of about 1013 cm−3 are observed. The average spatial distribution of Ar metastables is characterized with and without a target in front of the jet, showing that the target potential and, therewith, the electric field distribution substantially change the filaments' expansion. Together with a detailed analysis of the ignition phase and the discharge's behavior under pulsed operation, the results give an insight into the excitation and de-excitation mechanisms.