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radiant intensity, I

Also contains definition of: intensity

Radiant power, P, at all wavelengths per solid angle, Ω. The radiant power emitted in a given direction by a source or an element of the source in a small cone containing the given direction divided by the solid angle of the cone. SI unit is W sr −1.
Notes:
  1. Mathematical definition: I = d P / d Ω. If the radiant power is constant over the solid angle considered, I = P / Ω.
  2. Equivalent to I = ∫ λ I λ ⁢ d λ, where I λ is the spectral radiant intensity at wavelength λ.
  3. It is not recommended to abbreviate this term to just intensity because it is confusing.
Source:
PAC, 2007, 79, 293 (Glossary of terms used in photochemistry, 3rd edition (IUPAC Recommendations 2006)) on page 410
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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. doi:10.1351/goldbook.
Last update: 2014-02-24; version: 2.3.3.
DOI of this term: doi:10.1351/goldbook.R05045.
Original PDF version: http://www.iupac.org/goldbook/R05045.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 The PDF version is out of date and is provided for reference purposes only.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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