Hannover 2016 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 11: Posters 2: Novelties in Molecular Physics: Femtosecond Spectroscopy, Quantum Control, Electronic Spectroscopy, Biomolecules and Photochemistry
MO 11.13: Poster
Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof
Why Did Nobody Report on Single-Molecule Experiments on FMO Yet? — •Alexander Löhner1, Khuram Ashraf2, Richard Cogdell2, and Jürgen Köhler1 — 1Experimental Physics IV and Bayreuth Institute of Macromolecular Research (BIMF), University of Bayreuth, Germany — 2Institute of Molecular, Cell & Systems Biology, College of Medical Veterinary and Life Sciences, University of Glasgow, United Kingdom
In green-sulfur bacteria sunlight is absorbed by chlorosomes and transferred to the RC via the Fenna-Matthews-Olson (FMO) complex. FMO consists of three monomers each accommodating eight BChl a molecules, and was the first pigment-protein complex for which the structure has been determined with atomic resolution [1]. Since then this complex has been the subject of numerous studies both experimentally and theoretically.
Here we report about fluorescence-excitation spectroscopy as well as emission spectroscopy from individual FMO complexes at low temperatures. It appears that the FMO complexes are subjected to very fast spectral fluctuations resulting in spectra that resemble those from ensembles that were recorded under the same experimental conditions. In other words, on the time scales that are experimentally accessible by single-molecule techniques the FMO complex features an ergodic behaviour.
[1] Fenna, Matthews, Nature 258 (1975), 573