Explanations I have read of why photons are emitted from atoms mention electrons being 'excited' to another energy level, and then returning to their base level, releasing a photon. I have also seen the occasional mention of 'fields' and I vaguely expect from what I've read that interaction of the electrons with these fields has some effect. I've also seen, but not used, Feynmann diagrams that involve additional particles.
Please can you (ideally) clarify what are the different theories and experimental evidence relating to electrons and photons because of changes to electron behavior?
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