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Franck Condon principle (Read 4811 times)
Gerrit-Jan Linker
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Franck Condon principle
10.11.10 at 12:34:34
Franck Condon principle
The Franck–Condon principle states that during an electronic transition, a change from one vibrational energy level to another will be more likely to happen if the two vibrational wave functions overlap more significantly.
The principle is a rule in spectroscopy and quantum chemistry that explains the intensity of vibronic transitions.  
Vibronic transitions are the simultaneous changes in electronic and vibrational energy levels of a molecule due to the absorption or emission of a photon of the appropriate energy.
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.  
See also:
Condon Approximation
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« Last Edit: 09.07.12 at 16:31:00 by Gerrit-Jan Linker »  

Gerrit-Jan Linker
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