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Atomic physics is the field of physics that studies atoms as an isolated system of electrons and an atomic nucleus. It is primarily concerned with the arrangement of electrons around the nucleus and the processes by which these arrangements change. This includes ions as well as neutral atoms and, unless otherwise stated, for the purposes of this discussion it should be assumed that the term atom includes ions.

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Energy bands in semiconductors

I'm trying to understand the basic generalisations of how an atom works. I understand there are discrete energy levels or shells (in a simplified atomic model), in which only a specific number of elec …
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