| Autor: |
Herbrich, Sebastian, Al-Hadhuri, Tawfik, Gericke, Karl-Heinz, Shternin, Peter S., Smolin, Andrey G., Vasyutinskii, Oleg S. |
| Předmět: |
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| Zdroj: |
Journal of Chemical Physics; 2015, Vol. 142 Issue 2, p1-8, 8p, 1 Diagram, 4 Charts, 4 Graphs |
| Abstrakt: |
We present a detailed study of two-color two-photon excited fluorescence in indole dissolved in propylene glycol. Femtosecond excitation pulses at effective wavelengths from 268 to 293.33 nm were used to populate the two lowest indole excited states ¹La and 1Lb and polarized fluorescence was then detected. All seven molecular parameters and the two-photon polarization ratio O containing information on two-photon absorption dynamics, molecular lifetime tf, and rotation correlation time trot have been determined from experiment and analyzed as a function of the excitation wavelength. The analysis of the experimental data has shown that ¹Lb-¹La inversion occurred under the conditions of our experiment. The two-photon absorption predominantly populated the ¹La state at all excitation wavelengths but in the 287-289 nm area which contained an absorption hump of the ¹Lb state 0-0 origin. The components of the two-photon excitation tensor S were analyzed giving important information on the principal tensor axes and absorption symmetry. The results obtained are in a good agreement with the results reported by other groups. The lifetime tf and the rotation correlation time trot showed no explicit dependence on the effective excitation wavelength. Their calculated weighted average values were found to be tf = 3.83 ± 0.14 ns and trot = 0.74 ± 0.06 ns. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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