Hannover 2013 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 19: Poster 2: Biomolecules, Cold Molecules, Experimental Techniques, Various Topics
MO 19.14: Poster
Mittwoch, 20. März 2013, 16:00–18:30, Empore Lichthof
Conformer-specific reactions with Coulomb-crystallized ions — •Yuan-Pin Chang1, Karol Długołecki1, Jochen Küpper1,2,3, Daniel Rösch4, and Stefan Willitsch4 — 1Center for Free-Electron Laser Science, DESY, Hamburg — 2Department of Physics, University of Hamburg — 3Center for Ultrafast Imaging, University of Hamburg — 4Department Chemie, Universität Basel, Basel
Different conformations (rotational isomers) of a molecule can exhibit different reactivities, due to differences in "chemical shape" and electronic properties. This provides a perspective to manipulate chemical reactions by selecting molecular conformations. To explore this dependence, we study gas-phase bi-molecular reactive collisions between conformer-selected neutral molecules of 3-aminophenol [1] and Coulomb crystals of laser-cooled Ca+ ions [2]. 3-aminophenol is a prototypical complex molecules that exhibits two conformations with different electric dipole moments. They can be spatially separated in a molecular beam passing through an electrostatic deflector [1]. Coulomb-crystals of Ca+ ions spatially localized in an ion trap provide a suitable stationary target for the present reactive scattering study, due to high sensitivities to a level of single reaction events [2]. By tilting the molecular beam, only the purified conformation component react with ions. We present preliminary experimental results of conformer-specific reaction rates and theoretical calculations.
[1] F. Filsinger, et al, Phys. Rev. Lett. 100, 133003 (2008); F. Filsinger et al, Angew. Chem. Int. Ed. 48, 6900 (2009). [2] S. Willitsch, Int. Rev. Phys. Chem. 31, 175 (2012).