Oxygen cutting Nozzles 12 Electric discharges 8 Electron attachment 8 Impact ionization 8 Ions 8 Plasma diagnostics 8 Arc plasma 6 Cutting torch 6 Electron-ion recombinations 6 Ion-current signal 6 Ion-ion recombinations 6 Ionization of gases 6 Plasmas 6 Breakdown phenomena 4 Dynamics 4 Electric breakdown 4 Electric breakdown of gases 4 Electric fields 4 Electric space charge 4 Electrodes 4 Electrons 4 Experimental evidence 4 Experimental observation 4 High temperature gas 4 Insulating film 4 Metallic electrodes 4 Non destructive 4 Nonequilibrium plasmas 4 Nozzle orifice 4