Atomic Isolation: Conditions for Line Spectra

[Icetray]

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

 

[mathman]

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".