Three pulse UV photon echo studies of molecules in solution: effect of the chirp
Autor: | Ahmad Ajdarzadeh Oskouei, Andreas Tortschanoff, F. van Mourik, Andrea Cannizzo, Majed Chergui, Olivier Bräm |
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Rok vydání: | 2010 |
Předmět: |
Photon
Cyclohexane Dephasing Analytical chemistry General Physics and Astronomy medicine.disease_cause Molecular physics chemistry.chemical_compound Peak Shift high-speed optical techniques medicine Chirp Physical and Theoretical Chemistry Spectroscopy Polar Solvation Dynamics Diphenylacetylene Chemistry Excited-State Dynamics Tryptophan Proteins photon echo ultraviolet spectra Chromophore Schiff-Base Femtosecond Fluorescence molecule-photon collisions chirp modulation Heterogeneity organic compounds Room-Temperature Ultraviolet |
Zdroj: | The Journal of chemical physics. 133(6) |
ISSN: | 1089-7690 |
Popis: | We report on the electronic dephasing times of the nonpolar chromophore diphenylacetylene (DPA) in ethanol and in cyclohexane (polar and nonpolar solvents respectively) by photon echo measurements in the ultraviolet. Contrary to previous reports, we observed sub-100-fs electronic dephasing times for DPA in both solvents. We identify fast dynamics of tau=40 +/- 10 fs on the photon echo peak shift (PEPS) traces of DPA in ethanol. In addition, we observed a dependence of the PEPS asymptotic value on the temporal chirp of the pulses. We propose a model to describe it in terms of phase-matching condition and beam geometry. (C) 2010 American Institute of Physics. [doi:10.1063/1.3463448] |
Databáze: | OpenAIRE |
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