Stuttgart 2012 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 21: Poster 3: Cluster, Collisions, Energy Transfer, Photochemistry, Spectroscopy in He-Droplets
MO 21.13: Poster
Donnerstag, 15. März 2012, 16:30–19:00, Poster.IV
The impact of pump-probe geometries on excitation dynamics in high absorbing materials — •Sergej Bock, Sebastian Eicke, Volker Dieckmann, Kristin Springfeld, and Mirco Imlau — Department of Physics, University of Osnabrück, Germany
Photoswitchable ruthenium sulfoxides like [Ru(bpy)2(OSO)]+ (OSO: 2-methylsulfinylbenzoate) offer a light-induced linkage isomerization located at the SO-ligand resulting in a tremendous photochromism.
Studies regarding the photochromism and the kinetics of the generation and relaxation of the light-induced metastable isomers draw out an impact of the pump-probe geometry on the excitation dynamics, that arise from the pronounced pump-beam absorption.
This contribution focuses on the geometry impacts and we present a model that can describe the affected excitation dynamics.
The model will be confirmed by geometry dependent measurements of excitation dynamics on the basis of the mentioned photoswitchable ruthenium sulfoxide by pump-probe technique.
The simultaneous signal detection via Si PIN diodes and via a CCD line allow for measuring the dynamics parallel and perpendicularly to the direction of pump beam propagation as well as spatially resolved.
This measurements offer a deep insight in the impact of the pump-probe geometries on the excitation dynamics.
The contribution show up the reasons for the geometry impacts, a solution to avoid those impacts as well as the adaptability of the model to other high absorbing materials.
*Financial support: DFG (INST 190/137-1) and DAAD (50445542).