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Time-resolved spectroscopy of thioflavin T solutions: Asynchronous optical sampling method with two frequency-upconverted mode-locked lasers

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Title
Time-resolved spectroscopy of thioflavin T solutions: Asynchronous optical sampling method with two frequency-upconverted mode-locked lasers
Author(s)
Noh Soo Han; Kim, JunWoo; Tai Hyun Yoon; Minhaeng Cho
Publication Date
2022-02
Journal
Journal of Chemical Physics, v.156, no.6
Publisher
American Institute of Physics
Abstract
We carried out transient absorption spectroscopy of thioflavin T (ThT) molecules in various solvents employing an asynchronous optical sampling (ASOPS) scheme with dual synchronized and frequency up-converted mode-lock lasers in the near UV (NUV) spectral region. We developed a pair of synchronized femtosecond lasers with tunable center wavelengths ranging from 380 to 430 nm and spectral bandwidths of 30 nm. As a proof-of-principle experiment, we measured interferometrically detected time and frequency-resolved pump-probe signals of ThT in various solvents to study the twisted intramolecular charge transfer process of photo-excited ThT molecules. Both single-color NUV-NUV and two-color NUV-near IR (NIR) pump-probe measurements reveal that the vibronic coupling strengths of two vibrational modes with frequencies of 214 and 526 cm-1 in the excited state of ThT are reduced when ThT is dissolved in a chlorine-containing solvent, e.g., chloroform. We confirm theoretically that these vibrational modes have relatively high electric dipole moments in the excited state. As a result, the intramolecular charge transfer process of ThT in chloroform, which is driven by the solvation process of surrounding polar solvent molecules, could occur less efficiently, which results in an increase in the fluorescence quantum yield. Here, we demonstrate that the NUV-NUV and NUV-NIR ASOPS-transient absorption could be useful techniques for studying ultrafast photochemical reactions in condensed phases.
URI
https://pr.ibs.re.kr/handle/8788114/11599
DOI
10.1063/5.0077756
ISSN
0021-9606
Appears in Collections:
Center for Molecular Spectroscopy and Dynamics(분자 분광학 및 동력학 연구단) > 1. Journal Papers (저널논문)
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