��������������������IJ������������о�

利用纳秒脉冲放电在单针、环状、以及单针加环状三种不同电极结构下产生了均匀稳定的等离子体射流；通过光学和电学诊断研究了三种不同结构下等离子体射流的运行特性及相应的物理机制。实验结果表明，以上三种等离子体射流的转动温度均为295K，振动温度分别为1900K，2000K和2100K，都属于非平衡态等离子体；其中，基于单针和环状电极的混合型射流可产生更为均匀稳定的等离子体，且富含较多的活性物种，有望在材料表面处理及消毒灭菌等领域发挥一定作用。

Study of generation and investigation of nanosecond pulsed plasma jet

Three atmospheric nanosecond pulsed plasma jets are studied based on three different configurations. The first consists of an injection needle placed inside a hollow dielectric tube, while the second employs a ring electrode wrapped around a dielectric tube. The third is a hybrid of the first two configurations. The characteristics of the jets are diagnosed by optical and electrical methods, and the mechanism is studied. For these three plasma jets, the rotational temperature are all 295K, while the vibration temperature are 1900K, 2000K, and 2100K, respectively. The results above demonstrate that plasmas generated by these three nanosecond pulsed plasma jets are of the state of nonequilibrium. Furthermore, the investigation suggests that the hybrid jet with both the needle and the ring electrode connecting to the high-voltage has a better performance, for which a uniform and stable discharge with low temperature and higher reactive species is achieved. It is conceivable that the cold atmospheric nanosecond pulsed plasma jets have a great potential of application in the area of material processing，plasma chemistry and plasma medicine, etc.