UV illumination<unk> ce excitation and emission spectra of<unk>  The<unk> ce of this molecule is very intense; peak excitation occurs at 494 nm and peak emission at 521 nm.<unk>  has a pKa of 6.4, and its ionization equilibrium leads to pH-dependent absorption and emission over the range of 5 to 9. Also, the<unk> ce lifetimes of the protonated and deprotonated forms of<unk>  are approximately 3 and 4 ns, which allows for pH determination from nonintensity based measurements. The lifetimes can be recovered using time-correlated single photon counting or phase-modulation<unk> uorimetry.<unk>  has an isosbestic point (equal absorption for all pH values) at 460 nm.
Fluorescein
Anisodamine
Orellanine
Cyanoacrylate
Coricidin
Phthalate
Diatrizoate
Azo dye