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Apr 13, 2017 at 12:40 history edited CommunityBot
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Nov 5, 2016 at 19:03 comment added Prof. Legolasov The interaction happens through the EM field. Photons are quanta of the EM field.
Nov 5, 2016 at 0:00 vote accept Shing
Nov 4, 2016 at 23:23 answer added knzhou timeline score: 4
Nov 4, 2016 at 23:09 comment added Shing @knzhou I do not understand the spontaneous emission mechanism. I basically assume it does not take any interaction. Would you mind answering it?
Nov 4, 2016 at 23:04 comment added knzhou The point is that spontaneous emission is an interaction; the atom is always interacting with the (quantum) electromagnetic field via an interaction term in the Hamiltonian, whether or not the classical macroscopic field value is nonzero.
Nov 4, 2016 at 23:02 comment added Shing @knzhou There is not necessarily a electromagnetic field in the experiment, and the detector can be far away. Or rather, if a excited state will never emit a photon without electromagnetic field? (I read that the atom will spontaneously emit a photon.)
Nov 4, 2016 at 22:56 comment added knzhou I'm not sure what the question is here. The atom interacts with the electromagnetic field, which is then detected by the detector; it's pretty much a totally standard measurement. What is supposed to be "spontaneous"?
Nov 4, 2016 at 22:56 history edited Shing CC BY-SA 3.0
deleted 69 characters in body
Nov 4, 2016 at 22:50 history asked Shing CC BY-SA 3.0