Quartet state

{
  "id": "MLC-T-CHM-009767",
  "term": "Quartet state",
  "field": "Chemistry",
  "definition": "An electronic state with total spin quantum number S = 3/2, giving a spin multiplicity of 2S + 1 = 4. It arises from three unpaired electrons with parallel spins, plus any number of paired electrons. Quartet states occur in odd-electron species such as the ground state of the nitrogen atom and of chromium(III) complexes with a d3 configuration.",
  "subject": "Organic and Biomolecular Chemistry",
  "see_also": [
    "multiplicity"
  ],
  "references": [
    "PAC, 1996, 68, 2223. 'Glossary of terms used in photochemistry (IUPAC Recommendations 1996)' on page 2267 (https://doi.org/10.1351/pac199668122223)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/quartet-state/"
}