ELECTRONS IN MOTION
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Classical electromagnetism allows the rapidity of light field oscillations to be inferred from measurement of the speed and wavelength of light. Quantum mechanics connects the rapidity of electronic motion with the energy spacing of quantum states, accessible by light absorption and emission. These indirect measurements suggest that light as well as electrons vibrate within attoseconds, enabling us - among others - to see the world around us. Electronic motion is the primary step in any change of physical, chemical and biological properties of materials as well as in the functioning of living ...