{"term":{"id":"07312","doi":"10.1351\/goldbook.AT07312","code":"AT07312","status":"current","longtitle":"IUPAC Gold Book - absorbed (spectral) photon flux density","title":"absorbed (spectral) photon flux density","index":"quantity","version":"2.3.3","lastupdated":"2014-02-24","definitions":[{"id":"1","text":"Number of photons of a particular wavelength per time interval (spectral photon flux, number basis, qp,λ, or spectral photon flux, amount basis, qn,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: qp,λ0[1 - 10^(-A(λ))]\/V on number basis, qn,p,λ0[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, dC\/dt or the rate of change of the amount concentration, dc\/dt, respectively."},"links":[{"title":"absorbance","type":"internal","url":"https:\/\/dev.goldbook.iupac.org\/terms\/view\/A00028"},{"title":"wavelength","type":"internal","url":"https:\/\/dev.goldbook.iupac.org\/terms\/view\/W06659"},{"title":"quantum yield","type":"internal","url":"https:\/\/dev.goldbook.iupac.org\/terms\/view\/Q04991"},{"title":"spectral photon flux","type":"internal","url":"https:\/\/dev.goldbook.iupac.org\/terms\/view\/S05821"},{"title":"amount concentration","type":"goldify","url":"https:\/\/dev.goldbook.iupac.org\/terms\/view\/A00295"}],"math":[{"meaning":null,"type":null,"alttext":"qp,λ","latex":"q_{\\text{p},\\lambda }"},{"meaning":null,"type":null,"alttext":"qn,p,λ","latex":"q_{n,\\text{p},\\lambda }"},{"meaning":null,"type":null,"alttext":"V","latex":"V"},{"meaning":null,"type":null,"alttext":"s-1 m-4","latex":"\\text{s}^{-1}\\ \\text{m}^{-4}"},{"meaning":null,"type":null,"alttext":"s-1 cm-3 nm-1","latex":"\\text{s}^{-1}\\ \\text{cm}^{-3}\\ \\text{nm}^{-1}"},{"meaning":null,"type":null,"alttext":"mol s-1 m-4","latex":"\\text{mol s}^{-1}\\ \\text{m}^{-4}"},{"meaning":null,"type":null,"alttext":"einstein s-1 cm-3 nm-1","latex":"\\text{einstein}\\ \\text{s}^{-1}\\ \\text{cm}^{-3}\\ \\text{nm}^{-1}"},{"meaning":"Absorbed photon flux density (number basis)","type":"equation","alttext":"qp,λ0[1 - 10^(-A(λ))]\/V","latex":"\\frac{q_{p,\\lambda }^{0}[1 - 10^{-A(\\lambda )} ]}{V}"},{"meaning":"Absorbed photon flux density (amount basis)","type":"equation","alttext":"qn,p,λ0[1 - 10^(-A(λ))]\/V","latex":"\\frac{q_{n,p,\\lambda }^{0}[ 1 - 10^{-A(\\lambda )} ]}{V}"},{"meaning":"Absorbance (at a wavelength)","type":"quantity","alttext":"A(λ)","latex":"A(λ)"},{"meaning":"Wavelength","type":"quantity","alttext":"λ","latex":"λ"},{"meaning":null,"type":"numeric value","alttext":"0","latex":"0"},{"meaning":null,"type":"math","alttext":"dC\/dt","latex":"\\frac{dC}{dt}"},{"meaning":null,"type":"math","alttext":"dc\/dt","latex":"\\frac{dc}{dt}"}],"sources":["PAC, 2007, 79, 293. 'Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)' on page 297 (https:\/\/doi.org\/10.1351\/pac200779030293)"]}],"links":{"html":"https:\/\/dev.goldbook.iupac.org\/terms\/view\/AT07312\/html","json":"https:\/\/dev.goldbook.iupac.org\/terms\/view\/AT07312\/json","xml":"https:\/\/dev.goldbook.iupac.org\/terms\/view\/AT07312\/xml","plain":"https:\/\/dev.goldbook.iupac.org\/terms\/view\/AT07312\/plain","pdf":"https:\/\/dev.goldbook.iupac.org\/terms\/view\/AT07312\/pdf"},"citeas":"IUPAC. Compendium of Chemical Terminology, 2nd ed. (the \"Gold Book\"). Compiled by A. D. McNaught and A. Wilkinson. Blackwell Scientific Publications, Oxford (1997). Online version (2019-) created by S. J. Chalk. ISBN 0-9678550-9-8. https:\/\/doi.org\/10.1351\/goldbook.","license":"Licensed under Creative Commons Attribution-NoDerivatives (CC BY-NC-ND) 4.0 International (https:\/\/creativecommons.org\/licenses\/by-nc-nd\/4.0\/)","collection reuse":"For parties interested in reusing the entire IUPAC Gold Book please contact IUPAC here https:\/\/www.cognitoforms.com\/IUPAC1\/ContactInformationForm","disclaimer":"The International Union of Pure and Applied Chemistry (IUPAC) is continuously reviewing and, where needed, updating terms in the Compendium of Chemical Terminology (the IUPAC Gold Book). Users of these terms are encouraged to include the version of a term with its use and to check regularly for updates to term definitions that you are using.","accessed":"2023-09-26T18:25:23+00:00"}}