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 14.16: Poster

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

A novel technique to study time-resolved structural imaging of transition state dynamics — •Katrin Reininger, Friedrich Freyse, and Jochen Mikosch — Max-Born-Institute, Berlin

Progress in time-resolving transition state dynamics of bimolecular chemical reactions has been very limited due to the start-time dilemma and the absence of a significant probe mechanism, which gives insight into the structural dynamics.

We are developing a novel probe that images, one molecule at a time, the time-dependent spatial structure of individual transition states. For this we combine two modern techniques of molecular physics: (i) Reaction precursors are prepared as small clusters of ions and neutral molecules which serve as starting point for inducing transition state dynamics by photodissociation of a chromophore. The relative collision energy is tunable by varying the photodisscociation wavelength. (ii) Coulomb Explosion Imaging, induced by short and intense infrared laser pulses combined with full coincidence detection of the resulting positively charged fragments will then be used to follow the dynamics and ultimately to reconstruct the evolving spatial molecular structure.

We will present the experimental setup and its characterisation. First experiments on controlling vibrations in a diatomic molecule will be shown. To increase the repetition rate, the implementation of an Electrostatic Ion Beam Trap to recycle the ion target is investigated.