Dresden 2011 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 31: Poster: Collisions, Energy Transfer
MO 31.1: Poster
Donnerstag, 17. März 2011, 16:00–18:00, P1
Vibrational state-to-state reactive ion-molecule scattering — •Martin Stei1, Sebastian Trippel2, Rico Otto2, Jonathan Brox2, James Cox2, Thorsten Best1, and Roland Wester1 — 1Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstrasse 25/3, A-6020 Innsbruck — 2Physikalisches Institut, Universität Freiburg, Hermann- Herder-Str. 3, 79104 Freiburg
We present our latest studies on reactive scattering in crossed ionic and molecular beams. With an improved 3D-VMI setup we have measured vibrational state-to-state differential cross-sections of the reaction Ar+ + N2 → Ar + N2+ with significantly increased resolution. We find qualitative agreement with the theoretical predictions of Candori et al.[1] concerning the excitation of higher v and their scattering into larger angles, thus approaching a consistent description of this long-puzzling reaction[2]. We also report recent developments to study the influence of microsolvation on ion-molecule reactions. The combination of crossed-beam imaging with a multipole radio frequency ion trap allows us to prepare the ionic water clusters under well-defined initial conditions. First data have been obtained for the reaction of OH− · (H2O)n with CH3I. Finally we will give an outlook on our plans to scatter IR-laser excited CH3I to study the influence of vibrational spectator modes.
R. Candori, S. Cavalli, F. Pirani, A. Volpi, D. Cappelletti, P. Tosi, and D. Bassi , J. Chem. Phys. 115, 8888 (2001)
J. H. Futrell, Adv. Chem. Phys. 82, 501 (1992)