glowdischarge
Glowdischarge (commonly glow discharge) is a type of plasma formed when an electric current passes through a low-pressure gas between electrodes. It is characterized by visible luminescence and distinct spatial regions, including cathode dark spaces, the negative glow, Faraday dark space, positive column, and anode glow. The appearance and color of the discharge depend on the gas composition and excitation states of atoms and molecules.
The discharge is sustained by electron-impact ionization and secondary electron emission from the cathode. Free electrons
Glow discharges have many applications: lighting (neon and fluorescent lamps), thin-film deposition and sputter cleaning, materials