Triplet-triplet absorption

{
  "id": "MLC-T-CHM-012295",
  "term": "Triplet-triplet absorption",
  "field": "Chemistry",
  "definition": "The absorption of a photon by a molecule that is already in an excited triplet electronic state, promoting it to a higher-energy triplet state. This process occurs after intersystem crossing from an excited singlet state to the triplet manifold. Triplet-triplet absorption spectra are typically observed in transient absorption experiments using pulsed laser excitation.",
  "subject": "Analytical Chemistry",
  "see_also": [
    "absorption",
    "absorption spectrum",
    "triplet state"
  ],
  "references": [
    "PAC, 1984, 56, 231. 'Nomenclature, symbols, units and their usage in spectrochemical analysis-Part VI: molecular luminescence spectroscopy' on page 234 (https://doi.org/10.1351/pac198456020231)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/triplet-triplet-absorption/"
}