Mainz 2017 – scientific programme
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MO: Fachverband Molekülphysik
MO 2: Precision Experiments on Small Molecules
MO 2.3: Talk
Monday, March 6, 2017, 15:00–15:15, N 25
Crossed-beam velocity-map-imaging of the Ar+ + H2 charge-transfer reaction — •Tim Michaelsen1, Björn Bastian1, Jennifer Meyer1, Eduardo Carrascosa2, Dave Parker3, and Roland Wester1 — 1Universität Innsbruck, Austria — 2University of Melbourne, Australia — 3Radboud University, Nijmegen, Netherlands
The Reaction of Ar+ + H2 can proceed via atomic re-arrangement resulting in ArH+ + H or via charge transfer resulting in Ar + H2+. Here we will focus on the charge transfer pathway. Previous studies on this pathway predict a strong dependence of the reaction rate on the spin-orbit state of the Ar+ [1] and previous crossed-beam studies predict forward scattering with a large backward scattered fraction at low collision energies [2]. Additionally, theory and experiments predict a quasi-resonant behavior towards the product ion vibrational state H2+(v=2)[3].
Here, we present differential cross-sections obtained with a crossed-beam VMI-spectrometer for charge transfer reactions of Ar+ with H2 at energies below 1eV. We observe predominantly forward scattering, a dependence on the Ar+ spin-orbit state as well as dominant excitation of the H2+(v=2) state. Additionally, we compare these results to the charge-transfer reaction with D2, N2 [4] and O2.
[1] Tanaka K., et al. J. Chem. Phys 75.10 (1981): 4941-4945. [2] Hierl P., et al. J. Chem. Phys 67.6 (1977): 2678-2686. [3] Baer M., et al. J. Chem. Phys 93.7 (1990): 4845-4857. [4] Trippel S., et al. PRL 110.16 (2013): 163201.