Heidelberg 2015 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 9: Femtosecond Spectroscopy 2
MO 9.5: Vortrag
Dienstag, 24. März 2015, 15:45–16:00, PH/HS1
Tracking energy flow through the intact photosynthetic apparatus of green sulfur bacteria in situ. — •Jakub Dostál1, Jakub Pšenčík2, and Donatas Zigmantas3 — 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, D-97074 Würzburg, Germany — 2Faculty of Mathematic and Physics, Charles University in Prague, Ke Karlovu 3, 121 16 Prague, Czech Republic — 3Department of Chemical Physics, Lund University, P.O.Box 124, 221 00 Lund, Sweden
In order to utilize the energy of solar radiation the photosynthetic organisms developed various types of photosynthetic apparatuses. The photosynthetic apparatus of green sulfur bacterium Chlorobaculum tepidum consists of chlorosome - a massive light-harvesting antenna, FMO protein - the excitation energy conduit, and the reaction center. All the constituting complexes are clearly distinguishable in the absorption spectrum of the suspension of intact bacterial cells taken at low temperatures (77 K). This opens a possibility to study the light-harvesting processes by means of ultrafast time-resolved spectroscopy in situ. In this work we have applied coherent two-dimensional electronic spectroscopy to resolve the excitation energy flow through the entire photosynthetic apparatus.