Temporal evolution of molecular vibrational temperature in filamentary dielectric barrier discharge in nitrogen at atmospheric pressure

The experiment of filamentary dielectric barrier discharge (DBD) in nitrogen at atmospheric pressure has been studied, in which the needle-plate reactor was employed. The temporal evolution of vibrational temperature of the N2 (C3Πu→B3Πg) molecules was successfully recorded by optical emission spectrometry. And the N2 vibrational temperature was calculated at the different discharge voltage and pressure．The experiment results show that the molecular vibrational temperature of N2 ranges from 2 000 K to 3 500 K. It reduces with increasing time in both positive and negative semi-cycles of discharge, and it is always higher in the negative semi-cycle. The vibrational temperature rises with increasing discharge vol