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(a) Schematic of the device. (b) Photograph of the air plasma touched by a human finger. The distance between the needle tip and the finger is about 1 mm. (c) Photograph of the device.
(a) characteristic of the plasma. , , and are the voltages at three different locations, as shown in Fig. 1(a). I is the discharge current. (b) Zoom in the first three discharge current spikes I and the voltage on the needle .
Experimental and simulated spectra of second positive system 0-0 transition.
The emission spectra of the plasma for (a) 200–300, (b) 300–500, and (c) 500–800 nm.
Photograph of Enterococcus faecalis on agar in Petri dish treated by the plasma. The distance between the needle tip and the bacteria sample is about 1 mm. During the treatment, the Petri dish moves with a speed of about 2 mm/s in a crisscross pattern.
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