Investigation of an atmospheric pressure radio-frequency capacitive plasma jet

Two discharge modes can be sustained within certain limits. At RF input powers of 50-420 W an α-discharge can be sustained, however, below approximately 300 W the electrodes are only partially covered with the glow. At higher powers a breakdown occurs and a transition to a γ-discharge takes place, whereby the α-discharge dies out. The γ-discharge only covers a part of the electrodes and can be sustained down to powers of 50 W. Below this power the discharge extinguishes.