please could any one help
what could be the reason of the blue glow instead of the lavendar ?
the pressure , tempreture , gases concentration and voltage are shown on the panel picture
*edit*
i found that blue plasma color " depend on : gas species and the energy levels involved :
nitrogen , regaining an ionized electron ~ blue "
so how can i fix that practically ? should i reduce the applied voltage ?
Reham Mohamed Alzahrani The blue colour reminds me of the base of a methane, natural gas burner flame. Although this page does not give an answer, it shows others think about the question.
https://www.elgas.com.au/blog/1585-why-does-a-gas-flame-burn-blue-lpg-gas-natural-propane-methane/
But for a more scientific answer, Wikipedia once again is an excellent source
https://en.wikipedia.org/wiki/Flame
If you want lavendar-colored plasma, your base gas would be Argon, I suppose. The ammonia value in your picture is kind of confusing: it looks like you set a value of 90sccm, but no flux is displayed. That could indicate something about your MFC is odd. If it lets in random amounts of ammonia, a colour change to a nitrogen plasma isn't that surprising. Maybe check if that MFC is working properly. If you actually want to work with the ammonia, there is no problem about the plasma being blue.
Reham Mohamed Alzahrani
Check that there isn’t a leak in the system allowing nitrogen in from the air.
When energy is deposited to air, the air molecules become excited. As air is composed primarily of nitrogen and oxygen, excited N2 and O2 molecules are produced. These can react with other molecules, forming mainly ozone and nitrogen(II) oxide. Water vapor, when present, may also play a role; its presence is characterized by the hydrogen emission lines. The reactive species present in the plasma can readily react with other chemicals present in the air or on nearby surfaces.
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