Intersystem crossing

{
  "id": "MLC-T-CHM-005994",
  "term": "Intersystem crossing",
  "field": "Chemistry",
  "definition": "A non-radiative transition between two electronic states of different spin multiplicity, such as from a singlet state to a triplet state, or vice versa. This process involves a change in the total spin angular momentum of the molecule. It is a key step in phosphorescence and in many photochemical reactions, competing with fluorescence and internal conversion.",
  "synonyms": [
    "state crossing"
  ],
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "avoided crossing",
    "electronic state",
    "radiationless transition",
    "surface crossing"
  ],
  "references": [
    "PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2248 (https://doi.org/10.1351/pac199668122223)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/intersystem-crossing/"
}