The electronically excited states of LH2 complexes from Rhodopseudomonas acidophila strain 10050 studied by time-resolved spectroscopy and dynamic Monte Carlo simulations. I. Isolated, non-interacting LH2 complexes

Pflock, T.J., Oellerich, S., Southall, J. , Cogdell, R.J. , Ullmann, G.M. and Köhler, J. (2011) The electronically excited states of LH2 complexes from Rhodopseudomonas acidophila strain 10050 studied by time-resolved spectroscopy and dynamic Monte Carlo simulations. I. Isolated, non-interacting LH2 complexes. Journal of Physical Chemistry B, 115(28), pp. 8813-8820. (doi:10.1021/jp202353c)

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Publisher's URL: http://dx.doi.org/10.1021/jp202353c

Abstract

We have employed time-resolved spectroscopy on the picosecond time scale in combination with dynamic Monte Carlo simulations to investigate the photophysical properties of light-harvesting 2 (LH2) complexes from the purple photosynthetic bacterium Rhodopseudomonas acidophila. The variations of the fluorescence transients were studied as a function of the excitation fluence, the repetition rate of the excitation and the sample preparation conditions. Here we present the results obtained on detergent solubilized LH2 complexes, i.e., avoiding intercomplex interactions, and show that a simple four-State model is sufficient to grasp the experimental observations quantitatively without the need for any free parameters. This approach allows us to obtain a quantitative measure for the singlet-triplet annihilation rate in isolated, noninteracting LH2 complexes.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Cogdell, Professor Richard and Southall, Mrs June
Authors: Pflock, T.J., Oellerich, S., Southall, J., Cogdell, R.J., Ullmann, G.M., and Köhler, J.
Subjects:Q Science > QD Chemistry
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:07 June 2011

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