I was wondering, in the context of electron excitation and electron affinity, what it meant when we say that the electron absorbed energy or released energy. I think for electron excitation, the photon's energy, which is in the form of work= force time distance from the photon particle is absorbed to the electron. Then as the electron falls back down, for some odd reason of the universe, it releases another photon with the same work. For electron affinity, I believe that putting an electron in the atom for an atom that wants electrons will release energy in the form of work(heat), whereas an atom that does not want electrons, we have to force the atom to absorb the electron's work. Thanks PhysicsForums!!!