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Ultrafast experiments capture speed-of-light excitation delay as photon travels across H2 – Chemistry World

Photon excites one end of the molecule first, and then the other end 247 zeptoseconds later

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Scientists in Germany have measured a zeptosecond time delay between a photon hitting a dihydrogen molecule and its electrons being ejected. They say this birth-time delay corresponds to the time taken for the photon to travel the length of the molecule.
Photoionisation has been used for decades to explore the electronic structure of atoms and molecules. By measuring the energy of electrons ejected when a photon is absorbed, and calculating the difference in energy between the incident photon a…

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