Stokes shift

Also contains definition of: anti-Stokes shift
The difference (usually in frequency units) between the spectral positions of the band maxima (or the band origin) of the absorption and @[email protected] arising from the same electronic transition. Generally, the @[email protected] occurring at a longer @[email protected] than the absorption is stronger than the opposite. The latter may be called an anti-Stokes shift.
coherent radiation
PAC, 1996, 68, 2223. (Glossary of terms used in photochemistry (IUPAC Recommendations 1996)) on page 2278 [Terms] [Paper]