- 作者: Max Glasbeek, Hong Zhang and Michael van der Meer
- 中文摘要: Femtosecond fluorescence upconversion experiments have been performed for photoexcited auramine (a diphenylaminemethane dye) in liquid solution. Following pulsed laser excitation, the fluorescence shows a multiexponential decay with an initial fast decay of 2 ps. The lifetime of the relaxed excited state is 30 ps or longer, depending on the viscosity of the solvent. Concomitant with the initial fast decay a dynamic Stokes shift is observed. From a study of the excited state dynamics as a function of solvent viscosity it is concluded that auramine undergoes a picosecond (quasi)-barrierless relaxation from an emissive to a non-emissive excited state. The relaxation within the excited state arises from torsional diffusion motions of the phenyl rings of the auramine molecule.
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