Glow discharge color in a vacuum discharge
1. Argon, cathode bright area rose to light red, negative bright area blue, positive bright area purple.
2. Nitrogen, cathode glow rose, negative glow blue or purple, positive glow orange or red-yellow.
3.Helium gas, cathode bright area red, negative bright area light green, positive bright area purple red to yellow to light red.
4.Neon, cathode bright yellow, negative bright dark red, positive bright red.
5.Oxygen, cathode bright area red, negative bright area purple, positive bright area infrared lemon yellow.
6. Air, cathode glow rose, negative glow blue to pink, positive glow pink, blue under low pressure.
7.Steam: cathode bright area blue-white, negative bright area blue, positive bright area light blue.
8.Hydrogen: negative areas are brown to light red, negative areas are light blue, positive areas are red to pink.
Vacuum glow color under different pressures:
0.1 -- 1pa fluorescence -- off-white
1 -- 10pa pink -- red
10 -- 100pa fuchsia, the higher the vacuum degree, the redder
100 -- 1000pa purple -- purple beam
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