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Darmstadt 2008 – scientific programme

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MO: Fachverband Molekülphysik

MO 10: Kalte Moleküle III (gemeinsam mit Q)

MO 10.5: Talk

Tuesday, March 11, 2008, 15:00–15:15, 3G

Competing chemical dynamics in F + CH3Cl — •Rico Otto, Jochen Mikosch, Sebastian Trippel, Christoph Eichhorn, Matthias Weidemüller, and Roland Wester — Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg

Chemical reactions often show a variety of competing reaction mechanisms depending on the energy available. We have studied this for anion molecule nucleophilic substitution (SN2) reactions [1], which are described by a complex potential energy surface with a submerged barrier and by weak coupling of the relevant rotational-vibrational quantum states.

Here we present results for the anion molecule reaction F + CH3I which we studied in a crossed beam imaging experiment at low energies between 0.3 - 12.5 eV. We have observed three distinct reaction channels which we identified by time of flight analysis of the formed product ions. By mapping the transfer from translational energy into internal vibrational modes we could identify different reaction mechanisms for each of these channels.
J. Mikosch, S. Trippel, C. Eichhorn, R. Otto, U. Lourderaj, J. X. Zhang, W. L. Hase, M. Weidemüller, R. Wester, Science (in press)

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