Triplet-triplet transitions

{
  "id": "MLC-T-CHM-012298",
  "term": "Triplet-triplet transitions",
  "field": "Chemistry",
  "definition": "The spin-allowed electronic transitions between two different triplet states of a molecule. These transitions occur when a molecule already in an excited triplet state (T1) absorbs a photon, promoting it to a higher energy triplet state (Tn). Triplet-triplet absorption is a technique used to measure the properties and kinetics of triplet states, as the ground state (S0) to triplet state (T1) transition is spin-forbidden.",
  "subject": "Organic and Biomolecular Chemistry",
  "references": [
    "PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2282 (https://doi.org/10.1351/pac199668122223)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/triplet-triplet-transitions/"
}