Fluorescence

{
  "id": "MLC-T-CHM-004516",
  "term": "Fluorescence",
  "field": "Chemistry",
  "definition": "A type of photoluminescence involving the emission of light from a molecule or atom that has absorbed electromagnetic radiation. The emission occurs as the species relaxes from an excited electronic singlet state to a lower energy state, almost immediately after the absorption of the excitation energy. The process is characterized by a very short lifetime of the excited state, on the order of 1 to 100 nanoseconds.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "luminescence",
    "irradiation"
  ],
  "references": [
    "PAC, 1984, 56, 231. 'Nomenclature, symbols, units and their usage in spectrochemical analysis-Part VI: molecular luminescence spectroscopy' on page 233 (https://doi.org/10.1351/pac198456020231)",
    "PAC, 1994, 66, 2513. 'Nomenclature for radioanalytical chemistry (IUPAC Recommendations 1994)' on page 2519 (https://doi.org/10.1351/pac199466122513)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/fluorescence/"
}