Characteristic study of cold atmospheric argon plasma jets with rod-tube/tube high voltage electrode

Atmospheric argon plasma jets are generated with the rod-tube/tube high voltage electrode and a ring ground electrode at 8 kHz sinusoidal excitation voltage. It is found that the vibrational temperature, electronic excitation temperature, atomic oxygen density and spectral intensity with the rod-tube high voltage electrode are enhanced significantly than that with the tube high voltage electrode. The atomic oxygen density, molecular nitrogen density, and average electronic density are about magnitude of 1016 cm−3, 1015 cm−3, and 1012 cm−3 respectively, and the excited Ar, N2, OH and O are presented in the plasma plume with the rod-tube/tube high voltage electrode.

► The conduction and displacement current are determined by equivalent circuit diagram. ► The spectral characteristics are enhanced with the rod-tube high voltage electrode. ► The density of atomic oxygen and nitrogen are about 1016 and 1015 cm−3 magnitude. ► The average electronic density is in order of magnitude of 1012 cm−3.