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Photosynthetic complex LH2 – Absorption and steady state fluorescence spectra

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  • Zapletal, David
  • Heřman, Pavel

Abstract

Nowadays, much effort is devoted to the study of photosynthesis which could be the basis for an ideal energy source in the future. To be able to create such an energy source – an artificial photosynthetic complex, the first step is a detailed understanding of the function of photosynthetic complexes in living organisms. Photosynthesis starts with the absorption of a solar photon by one of the LH (light-harvesting) pigment–protein complexes and transferring the excitation energy to the reaction center where a charge separation is initiated. The geometric structure of some LH complexes is known in great detail, e.g. for the LH2 complexes of purple bacteria. For understanding of photosynthesis first stage efficiency, it is necessary to study especially optical properties of LH complexes. In this paper we present simulated absorption and steady-state fluorescence spectra for ring molecular system within full Hamiltonian model. Such system can model bacteriochlorophyll ring of peripheral light-harvesting complex LH2 from purple bacterium Rhodopseudomonas acidophila (Rhodoblastus acidophilus). Dynamic disorder (coupling with phonon bath) simultaneously with uncorrelated static disorder (transfer integral fluctuations) is used in our present simulations. We compare and discuss our new results with our previously published ones and of course with experimental data.

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  • Zapletal, David & Heřman, Pavel, 2014. "Photosynthetic complex LH2 – Absorption and steady state fluorescence spectra," Energy, Elsevier, vol. 77(C), pages 212-219.
    • Handle: RePEc:eee:energy:v:77:y:2014:i:c:p:212-219
    DOI: 10.1016/j.energy.2014.06.115
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    References listed on IDEAS

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    1. Amaro, Helena M. & Macedo, Ângela C. & Malcata, F. Xavier, 2012. "Microalgae: An alternative as sustainable source of biofuels?," Energy, Elsevier, vol. 44(1), pages 158-166.
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    4. Pavel Heřman & David Zapletal & Milan Horák, 2013. "Emission spectra of LH2 complex: full Hamiltonian model," The European Physical Journal B: Condensed Matter and Complex Systems, Springer;EDP Sciences, vol. 86(5), pages 1-6, May.
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