Transient grating spectroscopy in photosynthetic purple bacteria Rhodobacter sphaeroides 2.4.1

Mitsuru Sugisaki, Masazumi Fujiwara, Ritsuko Fujii, Katsunori Nakagawa, Mamoru Nango, Richard J. Cogdell, Hideki Hashimoto

Research output: Contribution to journalArticlepeer-review

5 Citations (Scopus)


The vibronic coherence of photosynthetic pigment-protein complexes has been investigated by means of transient grating spectroscopy using sub 20 fs optical pulses. In the present work, we focus our attention on the LH2 antenna complexes from Rhodobacter sphaeroides 2.4.1 because the information about their structure investigated by the electron and atomic force microscopy is available and the electric levels of pigments are well resolved, resulting in clear absorption spectrum. The vibronic coherent oscillations with a period of a few tens of femtoseconds have been clearly observed. We found that the temporal change of the coherent oscillations reflects the vibrational relaxation in the ground state. Calculations based on the Brownian oscillator model were performed under the impulsive excitation limit. The spectral density has been determined from the Raman measurement of spheroidene. Good agreement between the calculation and the experimental results has been achieved in the linear absorption spectrum and transient grating signal, which strongly supports the validity of our model.

Original languageEnglish
Pages (from-to)1908-1911
Number of pages4
JournalJournal of Luminescence
Issue number12
Publication statusPublished - Dec 2009
Externally publishedYes


  • Carotenoid
  • Coherent vibrational oscillations
  • Light-harvesting antenna
  • Photosynthesis
  • Transient grating spectroscopy

ASJC Scopus subject areas

  • Biophysics
  • Biochemistry
  • Chemistry(all)
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics


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