# Encyclopedia of electromagnetics

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file:photon_emission_absorption_magnetica_png

An electron (blue) is excited to a higher energy state by absorbing a photon (green), and a photon is released (emitted) when electron drops to a lower energy level. The same amount of energy difference ΔE = hv is involved in either transition. The nucleus (red) is positively charged.

This image is oversimplified for the purpose of illustration only. Electrons do not more on circular orbits, but on complex orbitals.

photon_emission_absorption_magnetica.png

You are permitted and indeed encouraged to use this image freely, for any legal purpose including commercial (the permission is hereby given, so there is no need to ask for it explicitly again), but you must always give the following credits:

S. Zurek, Encyclopedia Magnetica, CC-BY-4.0

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