At a given point in space, the
radiant energy incident on a small sphere divided by the cross-sectional area of that sphere. It is used in
photochemistry to specify the energy delivered in a given time interval (for instance by a
laser pulse).
Source:
ISO 31-5: 1992
(Quantities and Units - Part 5: Electricity and Magnetism.)
See also:
PAC, 1996, 68, 2223
(Glossary of terms used in photochemistry (IUPAC Recommendations 1996))
on page 2242
,
,
