Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 37: Cold Molecules III
Q 37.5: Vortrag
Mittwoch, 16. März 2011, 17:30–17:45, BAR Schön
Reaction of D− with H2 at low temperatures — •Stephanie Eisenbach1, Rico Otto1, Alexander von Zastrow1, Thorsten Best1,2, and Roland Wester1,2 — 1Physikalisches Institut, Universität Freiburg, Hermann-Herder-Str. 3, 79104 Freiburg — 2Institut f. Ionenphysik und Angewandte Physik, Universität Innsbruck, Technikerstr. 25/3, A-6020 Innsbruck
Tunneling through barriers, one of the most fundamental processes in quantum mechanics, can be an important reaction mechanism for chemical reactions at low temperatures see e.g. F+H2. Another example may be the isotope exchange reaction D−+H2 → H−+HD, with a reaction barrier height of 330 meV. This reaction can proceed over the barrier at high kinetic energies of the reactands [1]. In a 22-pole radio-frequency ion trap we can study reactions of buffer gas cooled molecular or atomic anions with neutral molecules down to 8 Kelvin temperature [2,3].
From these measurements an upper limit for the tunneling rate in H−+D2 is derived.
E. Haufler, et al., J. Phys. Chem. A 101, 6441 (1997)
R. Wester, J.Phys. B: At. Mol. Opt. Phys. 42, 154001 (2009)
R. Otto, et al., PRL 101, 063201 (2008)