V centres

{
  "id": "MLC-T-CHM-012482",
  "term": "V centres",
  "field": "Chemistry",
  "definition": "A type of colour centre in an alkali halide crystal consisting of a hole trapped at a cation vacancy. These defects are created when the crystal is exposed to ionizing radiation, which removes an electron from a halide ion, creating a hole. The hole can then become localized at a site where a positive ion is missing from the crystal lattice, forming a stable V centre that absorbs light at specific wavelengths.",
  "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 996 (https://doi.org/10.1351/PAC-REC-09-09-36)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/v-centres/"
}