Atomic Isolation: Conditions for Line Spectra

Icetray
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Hi Guys! *waves*

Anyway, I was just wondering what conditions and in what state are atoms sufficiently isolated so that it gives rise to a line spectra.

I thank you all for any help you provide in advance.

Many thanks,
Icetray
 
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The spectra of atoms consist of discrete lines determined by transitions between bound electron energy levels. I am not sure what you are thinking about when you ask about "isolated".
 

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