Hamburg 2009 – scientific programme
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MO: Fachverband Molekülphysik
MO 13: Molekülphysik Poster 1
MO 13.31: Poster
Tuesday, March 3, 2009, 16:30–19:00, VMP 8 Foyer
Anion molecule reaction dynamics — •Martin Stei1, Sebastian Trippel1, Petr Hlavenka1, Rico Otto1, Matthias Weidemüller2, and Roland Wester1 — 1Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg — 2Physikalisches Institut, Universität Heidelberg, Albert-Überle-Str. 3-5, 69120 Heidelberg
Anion-molecule reaction processes are known for their rich reaction dynamics, caused by a complex potential energy surface. We have carried out the first kinematically complete study of the SN2 reaction of Fl− and Cl−+ CH3I using crossed molecular beam imaging. Different reaction mechanisms were observed as a function of collision energy [1].
We report the improvement of the velocity imaging spectrometer, characterized by REMPI-spectroscopy of NH3. For improved 3D imaging we are currently adding a direct time-of-flight measurement. We have imaged the alignment and dissociation dynamics of CH3I in a strong laserfield by using nanosecond pulses. We will extend our research to investigating orientation effects in ion molecule reactions.
[1] J. Mikosch et al., Science 319, 183 (2008)