Electron attachment Ions 10 Impact ionization 8 Nozzles 8 Oxygen cutting 8 Electric discharges 6 Electron-ion recombinations 6 Ion-ion recombinations 6 Ionization of gases 6 Breakdown phenomena 4 Electric breakdown 4 Electric breakdown of gases 4 Electric space charge 4 Electrodes 4 Electrons 4 Experimental evidence 4 High temperature gas 4 Metallic electrodes 4 Partial discharges 4 Plasma torches 4 Space charge layers 4 Two dimensional model 4 Arc current 2 Arcing phenomena 2 Cavity resonators 2 Collisional plasmas 2 Collisional sheath 2 Computer simulation 2 Cutting torch 2 Discharge properties 2