Franck-Condon principle quantum mechanical formulation

Quantum-Mechanical Formulation of the Franck-Condon Principle... 

Franck-Condon integral, 97,132 Franck-Condon principle, 68, 94, 169 quantum mechanical formulation of, 96... 

The quantum mechanical formulation of this principle was given in Section 2.1.5 the intensity of a vibronic transition is proportional to the square of the Franck Condon integrals between the vibrational wavefunctions of the two states that are involved in the transition. Thus, the band shape of an electronic transition depends on the displacement of the excited electronic state relative to that of the ground state. This is illustrated for one vibrational degree of freedom of a given molecule in the schematic diagram in Figure 2.10. 

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