A new method, femtosecond time-resolved stimulated emission pumping fluorescence depletion (FS TR SEP FD), has been developed to study the vibrational relaxation of electronic excited states of molecules. Two relaxation rates of dye molecules in different solvents have been observed: (i) the intramo
Femtosecond time- and frequency-resolved fluorescence spectroscopy of a dye molecule
โ Scribed by A. Mokhtari; J. Chesnoy; A. Laubereau
- Publisher
- Elsevier Science
- Year
- 1989
- Tongue
- English
- Weight
- 501 KB
- Volume
- 155
- Category
- Article
- ISSN
- 0009-2614
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โฆ Synopsis
Transient, vibrationally resolved fluorescence spectra measured by femtosecond up-conversion are recorded for the dye nile blue in methanol solution. The time evolution of the fluorescence band position involves a subpicosecond decay followed by the wellknown solvatochromic relaxation. The timing of vibrational deexcitation which is related to the fluorescence bandwidth enables the energy pathway for this large molecule to be established in liquid solution.
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The time-and frequency-resolved fluorescence spectrum of a polar molecule in a polar solvent is expressed in terms of gas phase spectroscopic parameters of the solute, vibrational relaxation rates, the dielectric properties of the solvent, and the temporal profile of the excitation pulse. The fluore