Number of peaks (a), the intensity ratio of maximum to mean value (b) and discharge length (c) depending on the oxygen admixture. The results of 1156 cavities were averaged. The error bars indicate the standard deviation. Conditions: V = 1200V peak-to-peak voltage, f = 15kHz frequency, d = 200µm cavity diameter, gate time = 200ns, exposure time = 25ms.
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