Fig. 1. Atmospheric pressure pin-pin nanosecond pulsed discharges
(a): Schematic of experimental setup; (b): Waveforms of voltage and current

Fig. 2. The normalized continuum radiation spectra for different electron temperatures

Fig. 3. The optical emission spectra of nanosecond pulsed argon discharges at different times

Fig. 4. The experimental and theoretical calculated continuum spectra of nanosecond argon discharges at different times
(a): 5 ns; (b): 10 ns; (c): 15 ns; (d): 20 ns

Fig. 5. Experimental and simulated spectra of OH(A-X) in nanosecond pulsed discharges in atmospheric pressure Ar+0.5% H₂O

Fig. 6. Emission spectra of nanosecond pulsed discharges in atmospheric pressure Ar and Ar+0.5% H₂O