Stuttgart 2012 – scientific programme

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MO: Fachverband Molekülphysik

MO 21: Poster 3: Cluster, Collisions, Energy Transfer, Photochemistry, Spectroscopy in He-Droplets

MO 21.11: Poster

Thursday, March 15, 2012, 16:30–19:00, Poster.IV

Advances in imaging of ion molecule reactions — Rico Otto^1,2, •Eduardo Carrascosa¹, Martin Stei¹, Jonathan Brox³, Johannes von Vangerow¹, Fabian Hochheimer¹, Aditya Kelkar¹, Sebastian Trippel⁴, Thorsten Best¹, and Roland Wester¹ — ¹Institut f. Ionenphysik u. Angewandte Physik, Universität Innsbruck — ²now at: Department of Chemistry, University of California, San Diego — ³Physikalisches Institut, Universität Freiburg — ⁴now at: CFEL, DESY, Hamburg

In our group we have developed a crossed beam velocity map imaging apparatus to study ion molecule reactions. Here we report our studies on the influence of microsolvation in the reaction OH⁻·(H₂O)_n + CH₃I . Implementation of a multipole radio frequency ion trap allows us to prepare different anion water clusters in well defined initial states. Varying the collision energies between 0.5 - 2 eV reveals several reaction channels and a comparison with theoretical calculations leads to the conclusion that geometric effects play an important role in these reactions. We will also present the parametric characterization of spatial imaging (SMI) technique using laser and ion beams. A spatial resolution of less than 5 µm as well as 3D- SMI detection have been achieved and possible applications will be discussed. Finally, we will present initial plans for scattering of vibrationally excited CH₃I molecules and for dynamical studies of astrophysically relevant reactions, e.g. CO + H₃⁺.