Spin-flip transition

{
  "id": "MLC-T-CHM-011212",
  "term": "Spin-flip transition",
  "field": "Chemistry",
  "definition": "A transition between electronic states of a molecule or ion that involves a change in the total electron spin quantum number. Such transitions are formally forbidden by spectroscopic selection rules, resulting in very low absorption or emission intensities compared to spin-allowed transitions. An example is the transition from a singlet ground state to a triplet excited state, which is observed in phosphorescence.",
  "subject": "Inorganic Chemistry",
  "see_also": [
    "simultaneous pair transitions"
  ],
  "references": [
    "PAC, 1994, 66, 577. 'Definitions of terms relating to phase transitions of the solid state (IUPAC Recommendations 1994)' on page 590 (https://doi.org/10.1351/pac199466030577)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/spin-flip-transition/"
}