Stuttgart 2012 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 8: Photochemistry
MO 8.7: Vortrag
Dienstag, 13. März 2012, 12:00–12:15, V38.02
Towards ion molecule reactions in selected vibrational states — •Fabian Hochheimer, Martin Stei, Eduardo Carrascosa, Aditya Kelkar, Thorsten Best, and Roland Wester — Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck
The SN2 mechanism is one of the fundamental chemical reaction mechanisms. Using cross beam velocity map imaging our group has verified the long proposed direct SN2 mechanism in the reaction Cl− + CH3I → CH3Cl + I−[1]. The text book picture involves an inversion of the CH3 umbrella in the transition state [2]. As we could observe an efficient channeling of energy through the molecule, the question arises whether vibrational excitation of the umbrella mode acts as a spectator or influences the reaction. Using an IR-laser to prepare the molecular internal state prior to collision [3] may help to answer such questions. Here we report on our progress towards scattering of vibrationally exited CH3I and Cl−.
[1] J. Mikosch, S. Trippel, C. Eichhorn, R. Otto, U. Lourderaj, J.X. Zhang, W.L. Hase, M. Weidemüller, R. Wester, Science 319, 183 (2008)
[2] W. N. Olmstead, J. I. Brauman, J. Am. Chem. Soc., 99 (1977)
[3] W. Zhang, H. Kawamata, K. Liu, Science 325, 303 (2009)