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- Title
Fluorescence anisotropy of indole molecules under two-photon excitation in the spectral range of 485-510 nm.
- Authors
Sasin, M.; Tushkanov, V.; Smolin, A.; Vasyutinskii, O.
- Abstract
Decay of polarized fluorescence in indole dissolved in propylene glycol under two-photon excitation by femtosecond laser pulses in the wavelength range of 485-510 nm has been studied. It is shown that under the experimental conditions used the fluorescence decay signal can be well described by a single excited state lifetime τ and a single rotation diffusion time τ. By processing the data obtained, the times τ and τ as well as anisotropy parameter r characterizing the symmetry of two-photon excitation of indole molecules have been determined. Decreasing of the anisotropy parameter r down to zero under two-photon excitation energy higher than 5.1 eV has been observed. Interpretation of the obtained results have been done on the basis of ab initio quantum-mechanical computations. A model of energy relaxation under the condition of twophoton excitation of indole in a polar solvent has been discussed.
- Subjects
FLUORESCENCE anisotropy; INDOLE; EXCITATION equipment; PROPYLENE glycols; ANISOTROPY
- Publication
Optics & Spectroscopy, 2017, Vol 123, Issue 4, p569
- ISSN
0030-400X
- Publication type
Article
- DOI
10.1134/S0030400X1710023X