: Astronomie: Franck-Condon principle

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Franck-Condon principle

The Franck–Condon principle (named for James Franck and Edward Condon) is a rule in spectroscopy and quantum chemistry that explains the intensity of vibronic transitions (the simultaneous changes in electronic and vibrational energy levels of a molecule due to the absorption or emission of a photon of the appropriate energy). The principle states that during an electronic transition, a change from one vibrational energy level to another will be more likely to happen if the two vibrational wave functions overlap more significantly. (Wikipedia, The Free Encyclopedia, https://en.wikipedia.org/wiki/Franck%E2%80%93Condon_principle)

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