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• W2086878312 abstract "Abstract Femtosecond fluorescence dynamics of trans ‐azobenzene in hexane have been investigated on excitation to the S 1 (n, π*) state at 432 nm using the up‐conversion technique. Two transient components were observed to represent the fast and the slow S 1 fluorescence dynamics in the wavelength range of 550–732 nm. Based on the results obtained from recent ab initio calculations (Ishikawa, T.; Noro, T.; Shoda, T., J. Chem. Phys . 2001 , 115 , 7503), a dynamical picture is given in the following. Upon initial excitation to the S 1 state, the excited molecule is moving away from the first detection window within the observed 200–300 fs. The structural relaxation from the Franck‐Condon region may be responsible for the observed fast S 1 dynamics with the driving force being the CNNC twisting motion along the rotational coordinate. For the rest of the motion on the S 1 global potential surface, the excited molecule may search for the S 0 /S 1 conical intersection for an efficient internal conversion to the ground state. The nuclear motions for the observed slow S 1 dynamics not only involve the CNNC torsional coordinate but also the other degrees of freedom such as the CNN bending coordinate on the multidimensional S 1 potential energy surface. The whole electronic relaxation process occurs within the observed 1–2 ps. The slow S 1 dynamics were found to vary with the fluorescence wavelengths due to the influence of the solvent‐induced vibrational relaxation in the S 1 state; the vibrational relaxation should occur on a time scale comparable to the time scale of the electronic relaxation (S 1 →S 0 internal conversion)." @default.
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• W2086878312 date "2002-10-01" @default.
• W2086878312 modified "2023-10-16" @default.
• W2086878312 title "Femtosecond Fluorescence Dynamics of<i>trans</i>-Azobenzene in Hexane on Excitation to the S₁(n, π*) State" @default.
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• W2086878312 doi "https://doi.org/10.1002/jccs.200200103" @default.
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