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Anoop MD
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Neon is the lasing element in He-Ne laser. The lasing transition(632.8nm) is from 3s to 2p. In the energy level diagram there is one 1.15μm transition from 2s to 2p. But we studied that 2s orbital have lower energy than 2p then how it is possible, in the energy diagram, 2s level have higher energy than 2p level and one transition of 2s to 2p?
http://en.wikipedia.org/wiki/Helium–neon_laser#mediaviewer/File:Hene-2.png
http://en.wikipedia.org/wiki/Helium–neon_laser#mediaviewer/File:Hene-2.png