F centres

{
  "id": "MLC-T-CHM-004318",
  "term": "F centres",
  "field": "Chemistry",
  "definition": "Color centers in ionic crystals, consisting of an electron trapped in an anion vacancy. These defects absorb light in the visible region of the electromagnetic spectrum, giving the crystal a characteristic color. They are formed by irradiation or by heating the crystal in the vapor of the metal cation.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "colour centres"
  ],
  "references": [
    "PAC, 2011, 83, 931. 'Glossary of terms used in photocatalysis and radiation catalysis (IUPAC Recommendations 2011)' on page 952 (https://doi.org/10.1351/PAC-REC-09-09-36)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/f-centres/"
}