Preferred Label : absorbed (spectral) photon flux density;
IUPAC definition : 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, and the common unit is s-1 cm-3
nm-1. On amount basis, SI unit is mol s-1 m-4, and a common unit is einstein s-1 cm-3
nm-1.;
Scope note : 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, c t or the
rate of change of the amount concentration, c t , respectively.; mathematical expression: qp,¿0 1 10 -a¿
von number basis, qn,p,¿0 1 10 -a¿
von amount basis, where a¿ is the absorbance at wavelength ¿ and superscript
0(zero) indicates incident photons.;
Origin ID : AT07312;
See also
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, and the common unit is s-1 cm-3
nm-1. On amount basis, SI unit is mol s-1 m-4, and a common unit is einstein s-1 cm-3
nm-1.
