The intensity of allowed vibronic transitions is governed by the Franck Condon principle.
2.
The vibronic transition is indicated by a vertical arrow due to the assumption of constant nuclear coordinates during the transition.
3.
Later studies on the same anion were also able to account for vibronic transitions involving low-frequency lattice vibrations.
4.
In electronic spectroscopy, constructing a "'Deslandres table "'is a useful method to assign vibronic transitions.
5.
A transition in an energy level of an electron in a molecule may be combined with a vibrational transition and called a vibronic transition.
6.
Vibronic transitions are allowed at the classical turning points because both the momentum and the nuclear coordinates correspond in the two represented energy levels.
7.
Transitions that occur as a result of an asymmetrical vibration of a molecule are called vibronic transitions, such as those caused by vibronic coupling.
8.
Related phenomena including photoelectron spectroscopy, resonance Raman spectroscopy, luminescence, and fluorescence are not discussed in this article, though they also involve vibronic transitions.
9.
Figure 1 illustrates the Franck Condon principle for vibronic transitions in a molecule with Morse-like potential energy functions in both the ground and excited electronic states.
10.
Vibrational excitation can occur in conjunction with electronic excitation ( vibronic transition ), giving vibrational fine structure to electronic transitions, particularly with molecules in the gas state.
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