Figure 1

(a) Schematic diagram of NPP, (b) Schematic diagram of Ar-DBD, (c) Measurement of the optical emission spectra of NPP and (d) Measurement of the optical emission spectra of Ar-DBD.
(a) Schematic diagram of NPP, (b) Schematic diagram of Ar-DBD, (c) Measurement of the optical emission spectra of NPP and (d) Measurement of the optical emission spectra of Ar-DBD.