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 14.6: Poster

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

Toward ion-neutral collision measurements at the CSR — •Elisabeth A. Guerin, Florian Grussie, Aodh P. O'Connor, and Holger Kreckel — Max-Planck-Institut für Kernphysik, Heidelberg

To date, almost 200 molecules have been detected in the interstellar medium or circumstellar shells, including relatively complex organic molecules. It has become clear that two-body ion-neutral collisions play a critical role in the formation of molecules in the interstellar medium. However, with temperatures in interstellar clouds typically ranging from 10 to 100 K, the exact pathways and time scales of chemical reactions under these conditions are still poorly studied. In particular, thermal rate coefficients at relevant conditions have not been experimentally established for most ion-neutral reactions.

Simulating such reactions in a laboratory environment is one goal for the Cryogenic Storage Ring (CSR) located at the Max Planck Institute for Nuclear Physics in Heidelberg. Cooled ions (~10K) stored in the ring will be merged with a neutral atomic beam at a tunable center of mass collision energy. Reaction rate coefficients can be determined by measuring particle fluxes, beam overlap and the production rate of reaction products. The storage ring itself has been successfully commissioned in the summer of 2015 with the experimental vacuum chambers reaching temperatures below 10K. In the neutral beam setup, neutral particles will be created by photodetachment of a negative ion beam (kinetic energy up to 300 keV) which for this purpose is crossed with a continuous wave high-power diode laser (2 kW) operating at 808 nm.