If you're saying that it's like scattering, that means that the photon does give some energy to the excited atom in order to vibrate it and cause its fall. I guess the energy exchange can be negligible, but still something happens there doesn't it?
I understand the concept of stimulated emission and how it works as light amplification, but a certain technicality in its process eludes me. How is the inciting photon actually interacting with the electron that falls to a lower energy level?
In every physical interaction that I know of there...