Singlet-triplet energy transfer

{
  "id": "MLC-T-CHM-010908",
  "term": "Singlet-triplet energy transfer",
  "field": "Chemistry",
  "definition": "The transfer of excitation energy from an excited singlet donor to an acceptor that ends up in an excited triplet state. Because a singlet donor and a singlet acceptor have zero total spin while the final state includes a triplet, the process breaks the spin conservation rule and is normally very slow, although heavy atoms can enable it through spin-orbit coupling. The spin-allowed alternatives are singlet-singlet and triplet-triplet transfer.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "energy transfer",
    "singlet state",
    "spin conservation rule",
    "triplet state"
  ],
  "references": [
    "PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2273 (https://doi.org/10.1351/pac199668122223)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/singlet-triplet-energy-transfer/"
}