Electronic to vibrational energy transfer

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SUMMARY

The discussion centers on the process of electronic to vibrational energy transfer, specifically through vibronic transitions. It is established that a molecule can return to its ground state by transferring excitation energy into its vibrational degrees of freedom. The selection rules for this process involve symmetry considerations, where the coupling between ground and excited states requires a mode with the appropriate symmetry, typically denoted as A1g. Additionally, promoting modes play a crucial role in facilitating this coupling.

PREREQUISITES
  • Understanding of vibronic transitions in molecular physics
  • Familiarity with symmetry labels in quantum mechanics
  • Knowledge of Franck-Condon factors
  • Basic principles of vibrational modes in molecules
NEXT STEPS
  • Research the role of symmetry in vibronic transitions
  • Study the concept of Franck-Condon factors in detail
  • Explore the significance of promoting modes in molecular transitions
  • Learn about the mathematical formulation of selection rules in quantum mechanics
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This discussion is beneficial for chemists, physicists, and researchers in molecular spectroscopy, particularly those interested in energy transfer processes and the quantum mechanics of molecular states.

Katastrofa
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Let's say I have some simple molecule excited to higher electronic level. Is it possible that it goes back to its ground state by transferring the excitation energy into its vibrational degrees of freedom? I believe it is... what are the selection rules for such a process?
TIA
 
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Yes, that's called a vibronic transition. Usually there are many vibrational modes involved: There is one mode which has the right symmetry so as to couple the ground and the excited states, so if the grounnd state is totally symmetric, the symmetry label of that mode times the symmetry of the excited electronic state has to contain A1g. Usually that mode changes by only one quantum. Then there are many totally symmetric modes which change equilibrium position in the transition and lead to the so called Franck Condon factors.

Edit: The non-symmetric modes that make the coupling are called promoting modes.
 
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