The strongest fluorescence emission line of ethanol occurs at a wavelength of
Fluorescence is the emission of light by a substance that has absorbed light.
The emitted light usually has a longer wavelength than the absorbed radiation.
In ethanol, the easiest electrons to excite are the nonbonding electrons on the O atom.
They undergo an n → σ* transition at about 185 nm.
When aqueous ethanol is excited, it shows four fluorescence lines in the range
280 – 350 mm.
The strongest emission is at 330 nm.