SINCE 1828
Franck-Condon principle
noun
Franck-Con·don principle
| \ ˈfraŋkˈkändən-, -räŋ-\
Definition of Franck-Condon principle
: a principle in spectroscopy: the intensities of molecular spectral bands due to electronic transitions are consistent with the assumption that the relatively large mass of the atomic nuclei in the molecule prevents appreciable change in their configuration during such transitions
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