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Physics
Atomic and Condensed Matter
Radiative and Nonradiative Transitions
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[QUOTE="DrDu, post: 6004662, member: 210532"] Yes, in terms of the Born Oppenheimer approximation, each molecular energy level carries an electronic, a vibrational and a rotational quantum number (and maybe more for total angular momentum, nuclear spin ...). After excitation from the electronic and vibrational ground state, usually a state is obtained in which both electronic and vibrational quantum numbers are higher than in the ground state (see Franck-Condon principle). In a molecule, these states are nearly degenerate with highly excited vibrational states of the electronic ground state or lower lying electronic states. By non-adiabatic transitions (i.e. transitions which results from effect beyond the Born-Oppenheimer approximation), the initial excited state can develop in one of these vibrational excited states of lower electronic quantum number. This is then a radiationless transition. It is usually irreversible as the density of excited vibrational states with lower electronic quantum number is much higher than the density of excited vibrational (=electronic + vibrational) states. [/QUOTE]
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