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The Frank-Condon Principle states that transitions between electronic states correspond to vertical lines on an energy vs. internuclear distance diagram. The basis of this principle is that electronic transitions happen on a timescale that is significantly smaller than the vibrational period of a given molecule and therefore the distance at which they happen can be assumed to be fixed during the transition. This is significant for spectroscopy because the most intense spectral lines will correspond to transitions to the vibrational state in the upper electronic state that have the most overlap with the ground vibrational state in the lower electronic state. (From Thomas Engel's Quantum Chemistry and Spectroscopy)

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5mo ago

The Franck-Condon principle states that during an electronic transition, the nuclei of a molecule remain stationary. This principle allows for the approximation of the vibrational modes of the molecule before and after electronic excitation. It is particularly important in understanding processes such as absorption and emission spectra in spectroscopy.

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