Preferred Label : photon fluence rate;
Detailed label : photon fluence rate, Ep,o;
IUPAC definition : Rate of photon fluence. Total number of photons (Np) incident from u all directions
/u on a small sphere divided by the cross-sectional area of the sphere and per time
interval. SI unit is m-2 s-1. Same as photon spherical irradiance.;
Scope note : this quantity can be used on a chemical amount basis by dividing ep,o by the avogadro
constant, the symbol then being en,p,o, the name photon fluence rate, amount basis,
si unit is mol m-2 s-1;common unit is einstein m-2 s-1.; it reduces to photon irradianceepfor a parallel and normally incident beam not scattered
or reflected by the target or its surroundings.; mathematical definition: ep,o dnp dt ds
hp,o t . ifep,ois constant over the time interval and the surface, ep,o
np t s equivalent definition: ep,o ¿ 4p
lp with lp the photon radiance and¿the solid angle of the beams passing through the
given point on the surface.;
Origin ID : P04635;
See also
Rate of photon fluence. Total number of photons (Np) incident from u all directions
/u on a small sphere divided by the cross-sectional area of the sphere and per time
interval. SI unit is m-2 s-1. Same as photon spherical irradiance.
