The
radiant power at
wavelength \(\lambda \) per unit
wavelength interval. The SI unit is \(\rm{W m}^{-1}\), but a commonly used unit is \(\rm{W nm}^{-1}\).
Source: PAC, 1996,
68, 2223. (
Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2276 [
Terms] [
Paper]
See also: PAC, 1985,
57, 105. (
Names, symbols, definitions and units of quantities in optical spectroscopy (Recommendations 1984)) on page 112 [
Terms] [
Paper]