Abstract
Initial relaxation kinetics in a series of carotenes has been investigated using femtosecond absorption and Raman spectroscopy. The internal conversion from the photoexcited IBu- 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 bacterial photosynthesis.
Original language | English |
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Pages (from-to) | 15-23 |
Number of pages | 9 |
Journal | Proceedings of SPIE - The International Society for Optical Engineering |
Volume | 4812 |
DOIs | |
Publication status | Published - 2002 |
Event | Nonlinear Spectroscopy - Seattle, WA, United States Duration: 2002 Jul 8 → 2002 Jul 9 |
Keywords
- Carotenoid
- Femtosecond Raman spectroscopy
- Vibrational relaxation
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Computer Science Applications
- Applied Mathematics
- Electrical and Electronic Engineering