Vibronic transition

{
  "id": "MLC-T-CHM-012571",
  "term": "Vibronic transition",
  "field": "Chemistry",
  "definition": "A transition that involves a simultaneous change in both the electronic and vibrational energy states of a molecule. These transitions give rise to the fine structure observed within the electronic absorption and emission bands of molecular spectra. The intensity of each vibronic line is governed by the Franck-Condon principle, which relates the probability of a transition to the overlap between the vibrational wavefunctions of the initial and final electronic states.",
  "subject": "Organic and Biomolecular Chemistry",
  "references": [
    "PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2283 (https://doi.org/10.1351/pac199668122223)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/vibronic-transition/"
}