Mainz 2026 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 30: Poster – Molecular Spectroscopy
MO 30.22: Poster
Donnerstag, 5. März 2026, 17:00–19:00, Philo 1. OG
Wave packet interferometry with single LH2 complexes at ultrafast timescales — •Paul Recknagel1, Stephan Wiesneth1, Richard Hildner2, Richard J. Cogdell3, Alastair T. Gardiner4, and Jürgen Köhler1 — 1Spectroscopy of soft Matter, University of Bayreuth, 95440 Bayreuth, Germany — 2Zernike Institute for Advanced Materials, University of Groningen, The Netherlands — 3School of Molecular Biosciences, Glasgow University, UK — 4Institute of Microbiology of the Czech Academy of Sciences Třeboň, Czech Republic
Photosynthesis relies on capturing light energy by chromophores that are embedded in a network of pigment-protein complexes. The efficiency of this process depends crucially on the fine tuning of the electronic properties of the chromophores and their couplings to the protein environment. However, such complexes are flexible structures, that introduces a microscopic randomness which affects the delicate coordination of the mutual interaction strengths between chromophores and the protein scaffold. The peripheral light-harvesting complex LH2 from purple bacteria is one of the most studied model systems for understanding photosynthesis on a molecular level. We combined ultrafast time-resolved spectroscopy and linear fluorescence excitation spectroscopy to elucidate the energy transfer pathways (and the fluctuations thereof) within single LH2 complexes[1]. [1] S.Wiesneth et al, J. Am. Chem. Soc. 2025, 147, 40537-40546 (2025)
Keywords: Light harvesting; ultrafast spectroscopy; excitation spectroscopy; low temperatur; pigment-protein complexes