Vibrational relaxation of excited states in a series of carotenes with several polyene lengths

Masayuki Yoshizawa; Hideki Hashimoto

doi:10.1117/12.453738

1 November 2002 Vibrational relaxation of excited states in a series of carotenes with several polyene lengths

Masayuki Yoshizawa, Hideki Hashimoto

Proceedings Volume 4812, Nonlinear Spectroscopy; (2002) https://doi.org/10.1117/12.453738
Event: International Symposium on Optical Science and Technology, 2002, Seattle, WA, United States

Abstract

Initial relaxation kinetics in a series of carotenes has been investigated using femtosecond absorption and Raman spectroscopy. The internal conversion from the photoexcited 1B_u⁺ state to the 2A_g^- state is faster in the carotenes with middle polyene lengths. The vibrational relaxation of the 2A_g^- state has fast and slow components. The time constant of the slow component is longer than several picoseconds. The 2A_g^- 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 1B_u⁺ state which assists the internal conversion to the 2A_g^- state and the fast vibrational relaxation of the 2A_g^- state. The vibrational features of the excited states in carotenoids is very important in energy transfer mechanism of acterial photosynthesis.

Citation Download Citation

Masayuki Yoshizawa and Hideki Hashimoto "Vibrational relaxation of excited states in a series of carotenes with several polyene lengths", Proc. SPIE 4812, Nonlinear Spectroscopy, (1 November 2002); https://doi.org/10.1117/12.453738

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