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Stokes shift

   Also found in: Wikipedia 0.01 sec.
Stokes shift [′stōks ‚shift]
(spectroscopy)
The displacement of spectral lines or bands of luminescent radiation toward longer wavelengths than those of the absorption lines or bands.


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emis] (a) Code (mol:mol) (nm) (nm) PA1 1:0 480 -- PA2 1:0 nd -- PA3 1:0 485 -- PA4 1:0 509 -- PA1 1:1 502 +22 PA2 1:1 484 -- PA3 1:1 525 +40 PA4 1:1 -- (b) -- PA1 1:2 499 +19 PA2 1:2 487 -- PA3 1:2 531 +46 PA4 1:2 519 +10 PA1 1:3 506 +26 PA2 1:3 490 -- PA3 1:3 529 +44 PA4 1:3 521 +12 (a) Stokes shift of undoped and doped PAs in DMA solution.
Therefore, different fluorescent molecules have different excitation and emission values; this difference is called stokes shift.
Fluorescein has a relatively small Stokes shift of approximately 20 nm, and as can be seen in Fig.
 
 
 
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