Hannover 2013 – scientific programme

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MO: Fachverband Molekülphysik

MO 10: Femtosecond Spectroscopy II

MO 10.5: Talk

Tuesday, March 19, 2013, 12:15–12:30, F 102

High accuracy measurements of the electron transfer in photosynthetic reaction center of Rhodobacter Sphaeroides — •Pablo Nahuel Dominguez, Matthias Himmelstoß, and Wolfgang Zinth — Lehrstuhl für BioMolekulare Optic, Ludwig-Maximilians-Universität München, Oettingenstr. 67, 80538 München

Rhodobacter Sphaeroides is a purple bacteria with the most simple and well studied reaction center, which is capeble to convert energy from the sunlight into chemical energy via electron transfer and charge separation. This process has four intermediate states, and their observation requires high sensitiviy at very low excitation energies. Using new developments in subpicosecond pump-probe spectroscopy, we were able to produce transient absorption spectra for a large set of wavelengths at very low excitation which can be analyzed without any smoothing algorithm.The results confirm the existence of an intermediate radical pair state P+B- with a decay time of 0.9ps.