Mainz 2026 – scientific programme
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MO: Fachverband Molekülphysik
MO 20: Poster – Molecular Collisions and Kinetics
MO 20.3: Poster
Wednesday, March 4, 2026, 17:00–19:00, Philo 1. OG
Low-energy dynamics of the H2+(v = 2) + Ar reaction probed by velocity map imaging — •Jerin Judy, James K. Bateman, Dasarath Swaraj, Fabio Zappa, Viviane C. Schmidt, and Roland Wester — Institut für Ionenphysik und Angewandte Physik, Universität Innsbruck, Austria
Crossed-beam experiments combined with the velocity map imaging (VMI) technique are a robust tool for obtaining energy- and angle-resolved differential cross sections [1]. Here, we report low-collision-energy studies on the reaction between H2+(v = 2) and Ar. The reactant ion, H2+, is produced predominantly in its second excited vibrational state using a (3+1) REMPI scheme. The reaction proceeds through two pathways-charge transfer and proton transfer-which we probe via Ar+ and ArH+, respectively. The charge transfer pathway exhibits a quasi-energy resonance between reactants and products. The velocity map images, together with the extracted product internal-energy and angular distributions, provide new detailed insights into the underlying reaction mechanisms.
[1] R. Wester, Phys. Chem. Chem. Phys. 16, 396 (2014).
Keywords: Crossed beam; Velocity Map Imaging; Reaction dynamics; Ion molecule reaction; Resonance