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Please use this identifier to cite or link to this item: http://ntour.ntou.edu.tw:8080/ir/handle/987654321/27703

Title: Femtosecond Pump-Probe Study of Molecular Vibronic Structures and Dynamics of a Cyanine Dye in Solution
Authors: T.-S. Yang;M.-S. Chang;R. Chang;M. Hayashi;S. H. Lin;P. Vohringer;W. Dietz;N. F. Scherer
Contributors: NTOU:Institute of Optoelectronic Sciences
Keywords: organic compounds;potential energy surfaces;vibrational states;ground states;excited states;time resolved spectra;visible spectra;vibronic states
Date: 1999-06-22
Issue Date: 2011-10-21T02:32:59Z
Publisher: Journal of Chemical Physics
Abstract: Abstract:Time-resolved pump–probe spectra of 1,1′,3,3,3′,3′-hexamethyl-4,4′,5,5′-dibenzo-2,2′indotricarbocyanine (HDITC), a cyanine dye, in ethylene glycol are obtained using 11 fs and 90 fs duration pulses and analyzed in order to study its potential energy surfaces and vibrational dynamics. Ten oscillatory frequencies ranging from 30 cm−1 to 1400 cm−1 are observed in the 11 fs duration wavelength-resolved pump–probe measurements. They are assigned as fundamental vibrational frequencies of HDITC. The relative displacements of the equilibrium position between electronic excited and ground states along the resolved ten vibrational modes are determined through the wavelength dependence of the oscillatory amplitude. After considering the contributions of the ten vibrational modes, it is found that most of the Stokes shift and the early fast decays of the pump–probe signals are due to relaxation along the low frequency overdamped modes of the chromophore. The overdamped modes are characterized by the 90 fs pump–probe signals with the excitation at the red edge of the absorption band. © 1999 American Institute of Physics.
Relation: 110(24), pp.12070-12081
URI: http://ntour.ntou.edu.tw/handle/987654321/27703
Appears in Collections:[光電科學研究所] 期刊論文

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