Exciton self trapping in photosynthetic pigment–protein complexes studied by single-molecule spectroscopy

Kunz, R., Timpmann, K., Southall, J. , Cogdell, R.J. , Freiberg, A. and Köhler, J. (2012) Exciton self trapping in photosynthetic pigment–protein complexes studied by single-molecule spectroscopy. Journal of Physical Chemistry B, 116(36), pp. 11017-11023. (doi:10.1021/jp3040456)

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Abstract

Evidence for the formation of self-trapped exciton states in photosynthetic antenna complexes is provided by comparing single-molecule fluorescence–excitation and emission spectra that have been recorded from the same individual LH2 complex from Rhodopseudomonas acidophila. While the excitation spectra showed the signatures for the B800 and B850 bands as observed previously, two distinctively different types of emission spectra were found. One group of antenna complexes shows spectra with a relatively narrow spectral profile with a clear signature of a zero-phonon line, whereas the other group of complexes displays spectra that consist only of a broad featureless band. Analysis of these data reveals clear correlations between the spectral position of the emission, the width of the spectral profile, and the associated electron–phonon coupling strength.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cogdell, Professor Richard and Southall, Mrs June
Authors: Kunz, R., Timpmann, K., Southall, J., Cogdell, R.J., Freiberg, A., and Köhler, J.
College/School:College of Medical Veterinary and Life Sciences > Institute of Molecular Cell and Systems Biology
Journal Name:Journal of Physical Chemistry B
Journal Abbr.:J. Phys. Chem. B
ISSN:1520-6106
ISSN (Online):1520-5207
Published Online:21 August 2012

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