1 November 2002 Vibrational relaxation of excited states in a series of carotenes with several polyene lengths
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Abstract
Initial relaxation kinetics in a series of carotenes has been investigated using femtosecond absorption and Raman spectroscopy. The internal conversion from the photoexcited 1Bu+ state to the 2Ag- state is faster in the carotenes with middle polyene lengths. The vibrational relaxation of the 2Ag- state has fast and slow components. The time constant of the slow component is longer than several picoseconds. The 2Ag- state in the short carotenes remains in the vibrational excited levels because of the slow vibrational relaxation. These properties can be explained in terms of the 1Bu+ state which assists the internal conversion to the 2Ag- state and the fast vibrational relaxation of the 2Ag- state. The vibrational features of the excited states in carotenoids is very important in energy transfer mechanism of acterial photosynthesis.
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Masayuki Yoshizawa, Masayuki Yoshizawa, Hideki Hashimoto, Hideki Hashimoto, } "Vibrational relaxation of excited states in a series of carotenes with several polyene lengths", Proc. SPIE 4812, Nonlinear Spectroscopy, (1 November 2002); doi: 10.1117/12.453738; https://doi.org/10.1117/12.453738
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