| Autor: |
Gion Calzaferri, L. Forss, Jürg Baumann, Th. Hugentobler |
| Rok vydání: |
1985 |
| Předmět: |
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| Zdroj: |
Journal of Photochemistry. 28:457-473 |
| ISSN: |
0047-2670 |
| DOI: |
10.1016/0047-2670(85)87040-4 |
| Popis: |
Emission-wavelength-dependent fluorescence decay times investigated by multiple-frequency picosecond phase fluorometry are reported for dilute (10−5 M) solutions of rhodamine 6G and coumarin 535. In glycerol both dyes show significant wavelength-dependent dual-exponential decay behaviour. In ethanol the decay of coumarin 535 is strictly single exponential with a slightly increasing lifetime towards longer wavelengths. Data have been corrected for the wavelength-dependent photomultiplier transit time difference which is 0.83 ps nm−1 for our set-up. The data are described by the kinetics of a two-level system for the excited state. Interpretation is given in terms of different conformations stabilized by glycerol. Rotational diffusion constants are presented for fluorescein, fluorescein ethyl ester and coumarin 535 in ethanol. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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