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absorbed (spectral) photon flux density

Number of photons of a particular wavelength per time interval (spectral photon flux, number basis, q p , λ, or spectral photon flux, amount basis, q n , p , λ) absorbed by a system per volume, V. On number basis, SI unit is s −1 m −4 common unit is s −1 cm −3 nm −1 On amount basis, SI unit is mol s −1 m −4 common unit is einstein s −1 cm −3 nm −1.
Notes:
  1. Mathematical expression: q p , λ 0 1 − 10 − A λ V on number basis, q n , p , λ 0 1 − 10 − A λ V on amount basis, where A λ is the absorbance at wavelength λ and superscript 0 (zero) indicates incident photons.
  2. Absorbed spectral photon flux density (number basis or amount basis) should be used in the denominator when calculating a differential quantum yield and using in the numerator the rate of change of the number concentration, d C d t or the rate of change of the amount concentration, d c d t, respectively.
Source:
PAC, 2007, 79, 293 (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 297
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Cite as:
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: http://goldbook.iupac.org (2006-) created by M. Nic, J. Jirat, B. Kosata; updates compiled by A. Jenkins. ISBN 0-9678550-9-8. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi:10.1351/goldbook.AT07312.
Original PDF version: http://www.iupac.org/goldbook/AT07312.pdf. The PDF version is out of date and is provided for reference purposes only. For some entries, the PDF version may be unavailable.
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