A symmetric double-sided arrangement with hemi-spherical alumina (Al2O3) covered metal electrodes was used for investigating single-filament DBDs. The thickness of the dielectric barriers was (0.50\u00b10.05) mm and the radius of curvature of their surface was (2.0\u00b10.1) mm. The gap distance between the electrodes was set to 0.5 mm, 1.0 mm or 1.5 mm, respectively, with a maximum error of 3%. The electrodes were implemented in a gas cell made of glass with two lateral quartz glass windows that allowed the observation of the DBDs from the UV to the near-infrared. The cell had a gas inlet at the top and an outlet to a vacuum pumping system at the bottom.
\n", "procedure": "Before filling the cell with a specific gas mixture, it was evacuated to p<10^(\u22124) mbar by a turbopump system (Pfeiffer, TSH261), and subsequently an additional membrane pump (Pfeiffer, MVP 020-3 AC) was used as a process pump in a bypass to adjust the pressure in the cell to either 0.6 bar or 1.0 bar. The DBDs were driven by unipolar positive square wave pulses with a repetition rate of 10 kHz and a pulse width of 1 \u00b5s. The amplitude of the applied voltage pulses was therefore systematically varied between 4 and 14 kV. The shape of the voltage pulses was specified by the high voltage pulse generator (Behlke, HTS 161-06 GSM) that was supplied by a high-voltage power supply (FUG, HCN 1400-12500) and controlled by a digital delay generator (NI, DG645).
\n" }, "medium": { "name": "N2-O2", "properties": "A gas mixture of 0.1 vol% O2 in N2 at a pressure of p = 1 bar and p = 0.6 bar, respectively, was used for all experiments.
\n", "procedure": "The gas flow through the cell was set to 100 sccm by mass flow controllers (MKS 179B with control unit MKS 647B) connected to gas cylinders (Air Liquide, gas purity 99.999%).
\n" }, "target": [], "diagnostics": { "name": "electrical measurements, current measurement, voltage measurement, ICCD imaging, streak camera imaging", "properties": "Electrical measurements were performed with fast voltage (Tektronix, P6015A) and current probes (custom-build according to https://doi.org/10.1088/1361-6595/aab6d5) and recorded with a digital sampling oscilloscope (R&S, RTO 1044, 4GHz, 20GS/s).
\nThe DBDs were observed simultaneously by an iCCD camera (Andor, iStar DH734-18U-A3, resolution: \u2206t \u2265 2ns, \u2206x \u2265 2\u00b5m) and a streak camera system (Hamamatsu, C5680-21C, resolution: \u2206t \u2265 20ps, \u2206x \u2265 2\u00b5m) connected to a long-distance microscope (Questar, QM100, UV transparent). Both cameras were sensitive in the UV and visible spectral range.
\n", "procedure": "All data were recorded spectrally-integrated.
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