Abstract: The optical emission spectroscopy of NO/N2 in dielectric barrier discharge (DBD) plasmas using a. c. with frequeucies of 50 Hz and 5 kHz has been studied at atmospheric pressure. Excited-state nitrogen atom was detected at 632, 674.5, 715.5 and 742 nm. The concentrations of the mixtures were measured by using chemilluminescence NOx analyzer and N2O infrared gas analyzer; the production of O2 was also monitored by an on-line mass spectrograph after the discharge. The reaction mechanism of the removal of NO in N2 in DBD plasma was discussed.

Key words: Atmospheric pressure, Dielectric barrier discharge, Plasma, NO, Nitrogen atom, Optical emission spectroscopy, MS