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Dresden 2011 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 11: Poster: Transport and Spectroscopy in Molecular Nanostructures (Intersectional Session with CPP)

MO 11.7: Poster

Dienstag, 15. März 2011, 18:00–20:00, P1

Quest for spatially correlated fluctuations in light-harvesting systems — •Carsten Olbrich1, Johan Strümpfer2, Klaus Schulten2, and Ulrich Kleinekathöfer11Jacobs University Bremen, Bremen, Germany — 2University of Illinois, Urbana, USA

Photosynthesis is one of the essential mechanisms in nature to harvest energy for biochemical processes in plants and certain kinds of bacteria. Specific pigment-protein complexes, so-called light-harvesting (LH) complexes, have the function of absorbing light and transporting the energy to the photosynthetic reaction center. A few years back, experimental evidence has been reported for a coherent energy-transfer dynamics at 77 K in FMO. Based on molecular dynamics simulations at ambient temperatures, electronic structure calculations for the vertical excitation energies of the individual bacteriochlorophylls along the trajectory have been performed. Neither for the LH2 complex of Rhodospirillum molischianum nor for the FMO complex of the bacterium Chlorobaculum tepidum strong correlations have been found in the energy fluctuations [1,2]. In addition, the obtained data can be used to determine spectroscopic properties of the complexes [3].
[1] C. Olbrich, U. Kleinekathöfer, J. Phys. Chem. B. 114, 12427 (2010).
C. Olbrich, J. Strümpfer, K. Schulten, U. Kleinekathöfer, J. Phys. Chem. B. (in press).
C. Olbrich, J. Liebers, U. Kleinekathöfer, phys. stat. sol. (b) (in press, DOI:10.1002/pssb.201000651).

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