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MO: Fachverband Molekülphysik

MO 26: Poster: Biomolecules

MO 26.4: Poster

Donnerstag, 11. März 2010, 16:00–18:30, Lichthof

Fluorescence Blinking of the RC-LH1 core complex from Rhodopseudomonas palustris — Sarah Unterkofler¹, •Tobias Pflock¹, Richard Cogdell², and Jürgen Köhler¹ — ¹Experimentalphysik IV, Universität Bayreuth, D-95447 Bayreuth — ²Glasgow Biomedical Research Centre, University of Glasgow, UK

We present low-temperature (1.5 K) fluorescence blinking studies on individual RC-LH1 core complexes of the photosynthetic bacterium Rhodopseudomonas palustris.

For the majority of the recorded time traces, blinking could not be observed within the experimental time resolution. For the complexes where blinking could be resolved, the off-times as well as on-times were power-law distributed. These times are associated with the charge-separated state of the reaction centre (RC). We discuss the findings in the context of blinking experiments that have been performed on quantum dots [1] as well as on molecular systems [2].

[1]R. Verberk et al., Phys. Rev. B 66, 233202 (2002)

[2]D. Ernst et al., Chem. Phys. Lett. 482, 93 (2009)