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Is there such a thing as forbidden boundfree atomic transitions? 
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#1
Nov1413, 02:27 PM

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So I've been studying forbidden transitions and metastable states in atoms, etc., and I was just wondering if there is such a thing as forbidden boundfree transitions? I've only encountered boundbound.
For example, if you have a neutral Helium atom with two electrons, I understand how forbidden transitions arise within that ion. But are there certain energy levels for which the transition to the ionised state is forbidden? Thanks for any information! I tried googling but wasn't able to figure it out. 


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