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:

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.
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

Related index:

IUPAC > Gold Book > math/physics > quantities

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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. https://doi.org/10.1351/goldbook.

Last update: 2014-02-24; version: 2.3.3.

DOI of this term: https://doi.org/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 The PDF version is out of date and is provided for reference purposes only.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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