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photon exitance, M p

Also contains definition of: specific photon emission

Synonym: photon emittance

Photon flux, number basis, q p, emitted by an element of the surface containing the source point under consideration divided by the area S of that element. SI unit is s −1 m −2.
  1. Mathematical definition: d q p / d S. If q p is constant over the surface area considered, M p = q p / S.
  2. Formerly called photon emittance.
  3. This quantity can be expressed on a chemical amount basis by dividing M p by the Avogadro constant. In this case the symbol is M n , p, the name 'photon exitance, amount basis', SI unit is mol s −1 m −2; common unit is einstein s −1 m −2.
PAC, 2007, 79, 293 (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 394
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IUPAC. Compendium of Chemical Terminology, 2nd ed. (the "Gold Book"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). XML on-line corrected version: (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8.
Last update: 2014-02-24; version: 2.3.3.
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