Hannover 2016 – wissenschaftliches Programm
Bereiche | Tage | Auswahl | Suche | Aktualisierungen | Downloads | Hilfe
MO: Fachverband Molekülphysik
MO 11: Posters 2: Novelties in Molecular Physics: Femtosecond Spectroscopy, Quantum Control, Electronic Spectroscopy, Biomolecules and Photochemistry
MO 11.15: Poster
Dienstag, 1. März 2016, 16:30–19:00, Empore Lichthof
Time-resolved fluorescence of 2-dimensional crystals of LH2 complexes — •Inga Elvers1, Pu Qian2, Neil Hunter2, Richard Hildner1, and Jürgen Köhler1 — 1Experimental Physics IV, University of Bayreuth, 95440 Bayreuth, Germany — 2Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, United Kingdom
We investigate the fluorescence kinetics and energy transport properties of artificially arranged arrays of light-harvesting2 (LH2) complexes. The LH2 complexes were extracted from the purple bacterium Rba. sphaeroides and crystallised into 2-dimensional sheet-like or tubular crystals using a lipid from E. Coli. Employing a versatile streak-camera setup, we investigate the fluorescence kinetics of these arrays as a function of the excitation fluence and the repetition rate. We find that the lifetime of both samples are significantly shorter with respect to samples consisting of isolated LH2 complexes. Furthermore, the fluorescence decays of the arrays strongly depend on the variation of the excitation fluence and the repetition rate. These observations indicate the occurence of exciton-exciton annihilation processes and allows to study the energy transfer dynamics within these arrays.