Femtosecond studies of twisting dynamics of auramine in solution
| Autor: | Max Glasbeek, M.J. van der Meer, Hong Zhang |
|---|---|
| Přispěvatelé: | HIMS Other Research (FNWI), Spectroscopy and Photonic Materials (HIMS, FNWI) |
| Rok vydání: | 2000 |
| Předmět: |
Chemistry
Relaxation (NMR) Physics::Optics Condensed Matter Physics Photochemistry Fluorescence Molecular physics Atomic and Molecular Physics and Optics Photon upconversion Electronic Optical and Magnetic Materials symbols.namesake Picosecond Stokes shift Excited state Femtosecond Materials Chemistry symbols Physics::Chemical Physics Physical and Theoretical Chemistry Ground state Spectroscopy |
| Zdroj: | Journal of molecular liquids, 86, 123-126. Elsevier |
| ISSN: | 1873-3166 0167-7322 |
| Popis: | Femtosecond fluorescence upconversion experiments as performed for photoexcited auramine (a diphenylaminemethane dye) in liquid solution are discussed. Upon pulsed laser excitation the solute shows a dynamic Stokes shift as well as a drop in fluorescence intensity in only a few picoseconds. 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 state to a non-emissive excited state that decays to the ground state in about 30 ps. The relaxation is controlled by the torsional motions of the phenyl rings of the auramine molecule. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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