Stuttgart 2012 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 21: Poster 3: Cluster, Collisions, Energy Transfer, Photochemistry, Spectroscopy in He-Droplets
MO 21.11: Poster
Donnerstag, 15. März 2012, 16:30–19:00, Poster.IV
Advances in imaging of ion molecule reactions — Rico Otto1,2, •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+.