You have requested a machine translation of selected content from our databases. This functionality is provided solely for your convenience and is in no way intended to replace human translation. Neither SPIE nor the owners and publishers of the content make, and they explicitly disclaim, any express or implied representations or warranties of any kind, including, without limitation, representations and warranties as to the functionality of the translation feature or the accuracy or completeness of the translations.
Translations are not retained in our system. Your use of this feature and the translations is subject to all use restrictions contained in the Terms and Conditions of Use of the SPIE website.
1 November 2002Vibrational relaxation of excited states in a series of carotenes with several polyene lengths
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.
The alert did not successfully save. Please try again later.
Masayuki Yoshizawa, 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