Photon-Electron Interaction
This animation illustrates the absorption and emission of photons
by an atom. An electron revolving around the nucleus may capture an incident
photon. When that occurs, the electron is raised to a higher energy
level, and changes its orbit to one with a larger radius. While
in this excited state, eventually the electron reemits the photon and returns to the ground state. You can also watch for virtual photon emission, the phenomenon involving the emission of the photon and its
immediate recapture upon change of orbit.
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