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I wonder how, during the inelastic collision between and electron and
an atom, resulting in electronic excitation of the atom, energy is
transferred from the free electron to the atom. It's an
electromagnetic interaction. The free electron and the orbital
electrons in the atom repulse each other (I believe one of you
mentioned that yesterday); will the electron, while it is
decelerating, emit a photon? Is it this photon that excites the
atomic transition?