Hannover 2013 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 27: Poster 3: Collisions, Electronic Spectroscopy, Energy Transfer, Quantum Chemistry, Molecular Dynamics, Photochemistry, Spectroscopy in He-Droplets
MO 27.25: Poster
Donnerstag, 21. März 2013, 16:00–18:30, Empore Lichthof
Light-induced absorption dynamics of photofunctional [Ru(bpy)2(OSO)]+ — •Sebastian Eicke1, Volker Dieckmann1, Annika Kruse1, Kay-Michael Voit1, Lorenz Walder2, and Mirco Imlau1 — 1School of Physics, University of Osnabrück, Germany — 2School of Chemistry, University of Osnabrück, Germany
The dynamics of the light-induced absorption of a dense but fluid ensemble of photochromic [Ru(bpy)2(OSO)]+, that is determined within a pump-probe scheme, is analyzed by both, modeling and experimental investigations.
The intensities of pump and probing beams are significantly attenuated by absorption involving the ground and photoisomerized states.
Predictions of the derived model are (i) a dependence of the dynamics on the spatial position of the probing beam within the molecular ensemble, (ii) different dynamics for collinear or non-collinear propagation of pump- and probing beams and (iii) dynamics that depend on the molecular concentration of the ensemble.
These predictions are experimentally verified in an appropriate pump-probe configurations along the boundary conditions of the model.
We show that the findings can be successfully applied to analyze the temperature dependence of the dynamics of an ensemble of sulfoxide compounds.
The relation of the model quantities to quantum yield and activation energy is discussed.
*Financial support by the DFG (INST190/137-1)