Sugisaki, M., Fujiwara, M., Fujii, R., Nakagawa, K., Nango, M., Cogdell, R.J. and Hashimoto, H. (2009) Transient grating spectroscopy in photosynthetic purple bacteria Rhodobacter sphaeroides 2.4.1. Journal of Luminescence, 192(12), pp. 1908-1911. (doi: 10.1016/j.jlumin.2009.01.027)
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Publisher's URL: http://dx.doi.org/10.1016/j.jlumin.2009.01.027
Abstract
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
| Item Type: | Articles |
|---|---|
| Keywords: | Transient grating spectroscopy, coherent vibrational oscillations, carotenoid, light-harvesting antenna, photosynthesis |
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Cogdell, Professor Richard |
| Authors: | Sugisaki, M., Fujiwara, M., Fujii, R., Nakagawa, K., Nango, M., Cogdell, R.J., and Hashimoto, H. |
| Subjects: | Q Science > QR Microbiology |
| College/School: | College of Medical Veterinary and Life Sciences > School of Molecular Biosciences |
| Journal Name: | Journal of Luminescence |
| Publisher: | Elsevier, B.V. |
| ISSN: | 0022-2313 |
| ISSN (Online): | 1872-7883 |
| Published Online: | 05 April 2009 |
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