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10 November 2003 Ultrafast dynamics in a series of carotenoids investigated by time-resolved stimulated Raman spectroscopy
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Abstract
Vibrational relaxation in excited states of all-trans-carotenoids has been investigated using femtosecond stimulated Raman spectrosocpy with resolutions of 250 fs and 25 cm-1. The initially photoexcited 1B+u state in carotenoids relaxes to the 2A-g excited state within 1 ps. The 1B-u excited state is an intermediate state of the relaxation. After the relaxation to the 1A-g state, the excess energy is held in a C=C stretching mode (ν1) and remains longer than several picoseconds in short (mini) carotenes. Vibrational feature of carotenoids is of importance in energy transfer of phtoosynthesis. Femtosecond time-resolved vibrational spectroscopy is necessary to investigate the initial ultrafast kinetics.
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Masayuki Yoshizawa and Hideki Hashimoto "Ultrafast dynamics in a series of carotenoids investigated by time-resolved stimulated Raman spectroscopy", Proc. SPIE 5212, Linear and Nonlinear Optics of Organic Materials III, (10 November 2003); https://doi.org/10.1117/12.503934
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