Photon quantities

{
  "id": "MLC-T-CHM-008902",
  "term": "Photon quantities",
  "field": "Chemistry",
  "definition": "Radiometric quantities expressed as numbers of photons instead of energy, such as photon flux, photon irradiance and photon exposure, marked by a subscript p. They are the natural basis in photochemistry, because a reaction depends on how many photons arrive rather than on their total energy. A photon flux in photons per second converts to radiant power on multiplying by the photon energy hν.",
  "subject": "Physical and Biophysical Chemistry",
  "see_also": [
    "luminous quantities",
    "radiant quantities"
  ],
  "references": [
    "Green Book, 2nd ed., p. 30 (https://goldbook.iupac.org/files/pdf/green_book_2ed.pdf)"
  ],
  "url": "https://mlchart.com/terminology/chemistry/photon-quantities/"
}