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Proceedings Paper

Vibrational relaxation of excited states in a series of carotenes with several polyene lengths
Author(s): Masayuki Yoshizawa; Hideki Hashimoto
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Paper 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.

Paper Details

Date Published: 1 November 2002
PDF: 9 pages
Proc. SPIE 4812, Nonlinear Spectroscopy, (1 November 2002); doi: 10.1117/12.453738
Show Author Affiliations
Masayuki Yoshizawa, Tohoku Univ. (Japan)
Hideki Hashimoto, Osaka City Univ. (Japan)


Published in SPIE Proceedings Vol. 4812:
Nonlinear Spectroscopy
David L. Andrews, Editor(s)

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