Hannover 2016 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 14: Posters 3: Novelties in Molecular Physics: Theory of Molecular Dynamics, Collisions and Energy Transfer, and Experimental Techniques

MO 14.17: Poster

Mittwoch, 2. März 2016, 16:30–19:00, Empore Lichthof

Multiplex Detection of Homodyne Nonlinear Time-Resolved Signals for Multimodal Spectroscopy — •Andreas Ludwig, Takeshi Miki, Tiago Buckup, and Marcus Motzkus — Physikalisch-Chemisches Institut, Ruprecht-Karls-Universität, D-69120 Heidelberg, Germany

The goal of Multimodal Time-Resolved Spectroscopy is the combination of multiple time-resolved signals to understand complex molecular dynamics. Spectral resolution of such signals is a fundamental aspect because signal contributions in different techniques appear at different detection wavelengths. While detection at kHz rates of (self-) heterodyne signals, like those of transient absorption, is nowadays straightforward, the same is not true for weak homodyne signals. In this work, we have implemented a detection setup based on a spectrometer and kHz CCD. The setup covers the spectral range from 450 to 700nm with a resolution of about 1nm. Readout rates of up to 1.5kHz can be achieved. Synchronizing the CCD detector readout to the laser as well as to the scanning of optical delay stages enables shot-to-shot detection. The setup is benchmarked by detecting spectrally resolved third- and fifth-order techniques like degenerate four-wave mixing, pump-four wave mixing and 2D Raman at 1kHz readout rates. Dephasing of vibrational coherence in the excited state and coupling between different modes is demonstrated for different organic molecules in solution.