Hannover 2013 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 7: Femtosecond Spectroscopy I: Electronic 2D Spectroscopy (contributed for SYED in MO)
MO 7.1: Vortrag
Montag, 18. März 2013, 16:30–16:45, F 102
Coherent two-dimensional electronic spectroscopy of a directly linked porphyrin dimer in the Soret band — •Federico Koch1, Martin Kullmann1, Ulrike Selig1, Patrick Nuernberger1, Daniel C. G. Götz2, Gerhard Bringmann2, and Tobias Brixner1 — 1Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg — 2Institut für Organische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg
We examined the excitonic coupling of two states resulting from Davydov splitting in the Soret band of a directly β,β′-linked porphyrin dimer. In a transient absorption study the absorption change of the energetically higher lying state decreased on a timescale of ≈ 100 fs; in contrast, the absorption change linked to the energetically lower lying state decreased on a microsecond timescale (≈ 50 µs) [1]. Adapting previous models for covalently-linked porphyrin dimers, these dynamics were explained with an excitonic approach, but the states connected by coupling could only be inferred indirectly in the analysis. With coherent 2D electronic spectroscopy, we directly visualize the predicted population transfer between the corresponding excitonic states as a result of electronic coupling [2].
M. Kullmann, A. Hipke, P. Nuernberger, T. Bruhn, D. C. G. Götz, M. Sekita, D. M. Guldi, G. Bringmann, and T. Brixner, Phys. Chem. Chem. Phys. 2012, 14, 8038-8050
F. Koch, M. Kullmann, U. Selig, P. Nuernberger, D. C. G. Götz, G. Bringmann, and T. Brixner, New J. Phys., accepted 28 Nov 2012