411 REFERENCE · Wiktionary
Franck-Condon principle
Reference material by Wiktionary contributors. This retains its source identity and is not 411 news reporting.
English
Proper noun
1
A rule describing the intensities of vibronic transitions, or the absorption or emission of a photon, stating that when a molecule is undergoing an electronic transition, such as ionization, the nuclear configuration of the molecule experiences no significant change.
en eponyms