Darmstadt 2008 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 24: Kalte Moleküle
MO 24.1: Poster
Donnerstag, 13. März 2008, 16:30–19:00, Poster C1
Anion molecule reaction dynamics — •Rico Otto, Jochen Mikosch, Sebastian Trippel, Christoph Eichhorn, Petr Hlavenka, Matthias Weidemüller, and Roland Wester — Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg
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 Cl−+ CH3I using crossed molecular beam imaging [1]. Different reaction mechanisms are observed as a function of collision energy. Currently, we study molecular dissociation dynamics in strong laser fields. In addition our experimental approach for the study of reactive scattering with laser aligned molecules will be discussed.
Slow collisions of anions at fixed temperature are also investigated in a
22pole radio frequency trap. We could identify evaporation of stored ions
as the ultimate loss channel in this trapping device [2]. Proton transfer from
H2 to NH2− showed unexpected low temperature characteristics
in the reaction rate coefficient. Ab initio calculations were carried out in order
to explain this behaviour. The absolute cross section of OH− photodetachment
was measured using a tomography scan [3]. Two-dimensional tomography
scans at different temperatures reveal further details of the
ion density distribution.
J. Mikosch et al., Science (in press)
J. Mikosch et al., Phys. Rev. Lett. 98, 223001 (2007)
S. Trippel et al., Phys. Rev. Lett. 97, 193003 (2006)