大气压氩气微放电通道中电子激发温度的时间演化

利用双水电极介质阻挡放电装置，采用光谱方法测量了大气压氩气介质阻挡放电微放电通道 中的电子温度的时间演化.选取波长为69654nm(2P₂→1S₅)，763 51nm(2P₆→1S₅ )，77242nm(2P₂→1S₃)的氩原子谱线进行了时间分辨测量.实验 发现在放电期间，电 压波形开始下降，在放电熄灭后又开始上升.高能级为2P₂的跃迁（77242nm和 69654nm ）比2P₆的跃迁76351nm要延迟几十ns.根据其时间分辨谱，估算了微放电中的 电子激发 温度的时间演化，结果表明，电子激发温度并不是一个恒定值，而是随时间变化的.当放电 电流达到最大值，即电子密度达到最大值时，其电子温度并未达到最大值，而经过200ns 后 才达到最大值. 关键词： 大气压介质阻挡放电 发射光谱 电子激发温度 微放电通道

Temporal evolution of electron excited temperature in micro-discharge in argon at atmospheric pressure

The temporal evolution of electron excited temperature of micro-discharge in die lectric barrier discharge (DBD) in argon at atmospheric pressure is studied by s pectroscopy method. The time-resolved spectra of 69654nm (2P₂→1S< sub>5), 763 51nm (2P₆→1S₅) and 77242nm (2P₂→1S_{3) Ar are measured. It is found th at the voltage decreases during the discharge, and increases after the discharge quenched. The transition of lower level 2P6 (76351nm) is some doze ns of ns ahead of the transitions of higher level 2P2 (77242nm and 69654nm ). Accord ing to the time-resolved spectrum, the electron excited temperature is estimated during the discharges. It is shown that the temperature is not a constant.It is variable with the time.The peak value of temperature exists about two hundred n s time_delay after the peak value of the discharge current.It is shown that the electron excited temperature does not reach its peak value when the electron den sity is at the peak value.And the electron excited temperature reaches the peak value 200ns late.}