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

Masayuki Yoshizawa, Hideki Hashimoto

Research output: Contribution to journalConference articlepeer-review

1 Citation (Scopus)


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 languageEnglish
Pages (from-to)15-23
Number of pages9
JournalProceedings of SPIE - The International Society for Optical Engineering
Publication statusPublished - 2002
EventNonlinear Spectroscopy - Seattle, WA, United States
Duration: 2002 Jul 82002 Jul 9


  • 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


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