CO2 1 Carbon dioxide 1 Electric breakdown 1 Electrodes 1 Free moving particle 1 Free particles 1 Gaseous breakdown 1 Gaseous insulation Gases mixture 1 High speed imaging 1 Metallic particles 1 Moving particles 1 Particle breakdown 1 Particle motions 1 SF6 1 SF6 insulation 1 Sulfur hexafluoride 1 Video recording 1 free moving particle 1 gaseous breakdown 1 gaseous insulation 1 high-speed imaging 1