Plasma sheaths 20 Electric discharges 10 Electrodes 8 Plasma diagnostics 8 Electron temperature 6 Ions 6 Plasma devices 6 Atmospheric pressure 4 Cavity resonators 4 Electric fields 4 Electron attachment 4 Electron densities 4 Electrons 4 First negative systems 4 High energy densities 4 Langmuir probes 4 Mathematical models 4 Nozzle wall 4 Nozzles 4 Optical emissions 4 Oxygen 4 Oxygen cutting 4 Plasma density 4 Plasma jets 4 Plasma sheet 4 Positive systems 4 AC voltages 2 Ac voltage 2 Arc current 2 Arc power 2