Preferred Label : Franck–Condon principle;
IUPAC definition : Classically, the Franck–Condon principle is the approximation that an electronic transition
is most likely to occur without changes in the positions of the nuclei in the molecular
entity and its environment. The resulting state is called a Franck–Condon state, and
the transition involved, a vertical transition. The quantum mechanical formulation
of this principle is that the intensity of a vibronic transition is proportional to
the square of the overlap integral between the vibrational wavefunctions of the two
states that are involved in the transition.;
Origin ID : F02510;
See also
Classically, the Franck–Condon principle is the approximation that an electronic transition
is most likely to occur without changes in the positions of the nuclei in the molecular
entity and its environment. The resulting state is called a Franck–Condon state, and
the transition involved, a vertical transition. The quantum mechanical formulation
of this principle is that the intensity of a vibronic transition is proportional to
the square of the overlap integral between the vibrational wavefunctions of the two
states that are involved in the transition.
