Discharge Color
| Helium | Neon | Argon |
Krypton | Xenon |
The color of gas discharge emission depends on several factors, including the following:
- discharge parameters (local value of current density and electric field, temperature, etc. – note the color variation along the discharge in the top row);
- gas purity (even small fraction of certain gases can affect color);
- material of the discharge tube envelope – note suppression of the UV and blue components in the bottom-row tubes made of thick household glass.
Read more about this topic: Noble Gas
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