Re: Why is there no wavelength associated with a 1s2s-1s2 in He I para spectrum

Date: Sat May 3 17:57:01 2008
Posted By: Jerrold Franklin, Professor Emeritus
Area of science: Physics
ID: 1208845235.Ph

Message:


A 2s electron cannot decay to the 1s state, because there is no allowed L=0
to L=0 transition.  This is because emission of a photon requires at least one
unit of angular momentum.

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