Subpicosecond studies of the solvation dynamics of fluoroprobe in liquid solution Original Research Article

The dynamic Stokes shift of fluoroprobe in its lowest excited charge transfer state has been studied in a series of solvents, at room temperature, with a time resolution of about 300 fs. Using the fluorescent upconversion method dynamic Stokes shifts of up to 3000 cm−1 have been resolved. The Stokes shift is attributed to the solvent response to the large photoinduced dipole moment of fluoroprobe (∼ 30 D) in the fluorescent charge transfer state. The solvation dynamics is determined by the rotational diffusional motions of the ethereal solvent molecules.