Table 3. The four sets of discharge conditions used in this work.
| Voltage | Gas | ||
|---|---|---|---|
| DART glow discharge | Dark-current discharge (DCD) | ||
| (i) Ar-DART | On | Off | Argon |
| (ii) Ar-DART+DCD | On | On | Argon |
| (iii) Ar-DCD | Off | On | Argon |
| (iv) He-DART | On | Off | Helium |
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