Transient grating spectroscopy in photosynthetic purple bacteria Rhodobacter sphaeroides 2.4.1

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 > Institute of Molecular Cell and Systems Biology
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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