- #1
freetheparticle
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Einstein coefficients tell us that there is some probability for an atom to go from E_1 to E_2 given by the coefficient of absorption. This is fine, but why is there only one coefficient (absorption) going from E_1 to E_2 and two for the transition E_2 to E_1? Spontaneous emission makes sense but I can't wrap my head around stimulated emission. How can a photon "stimulate emission" if it doesn't come into existence until it is emitted by the particle?