Franck-Condon factor

{
  "id": "MLC-T-CHM-004644",
  "term": "Franck-Condon factor",
  "field": "Chemistry",
  "definition": "A dimensionless number between 0 and 1 equal to the squared overlap of the vibrational wave functions in the initial and final electronic states of a transition. It gives the relative probability that the transition connects a particular pair of vibrational levels, and for a given starting level the values sum to 1 over all final levels. Together with the electronic transition moment, it sets the intensity pattern of the vibronic bands.",
  "subject": "Organic and Biomolecular Chemistry",
  "references": [
    "PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 344 (https://doi.org/10.1351/pac200779030293)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/franck-condon-factor/"
}