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

Abstract

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→1S5), 763 51nm (2P6→1S5) and 77242nm (2P2→1S3) 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.