Ocean Optics Overture - Manual (Page 35)

Chapter 4: Experiments
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The spectrum below is taken from the side port using the fluorescence fiber. It shows a peak at 520 nm .
That is 70nm longer wavelength than the absorption peak. The difference between the absorbance and
fluorescence peaks is about 70nm. The dye is re-emitting light at a longer wavelength. This is called the
Stokes shift .