Mainz 2017 – scientific programme

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MO: Fachverband Molekülphysik

MO 16: Posters 3: Experimental Techniques and Theoretical Approaches

MO 16.13: Poster

Thursday, March 9, 2017, 17:00–19:00, P OG1

Cold collisions and slow reactions in a 22-pole trap — •Eric Endres, Daniel Hauser, Olga Lakhmanskaya, Steffen Spieler, Gerhard Egger, Malcolm Simpson, Fabio Carelli, Franco Gianturco, and Roland Wester — Institute for Ion Physics and Applied Physics, University of Innsbruck, Austria

Today the study of ion-molecule reactions moves towards cold chemistry which implies well controlled ion ensembles in a cold environment. A widely used tool to store and prepare ions by buffer gas cooling is a 22-pole rf ion trap [1].

For most applications it is important to know the translational and internal temperatures of the trapped ions. Here, we present detailed rotational state thermometry measurements over an extended temperature range for hydroxyl anions in different buffergases and show incomplete rotational cooling of OH⁻. Furthermore we present a method to manipulate and measure molecular quantum states by non-resonant photodetachment. Based on this we provide quantum scattering rate coefficients under full quantum state control for the rotationally inelastic collision of hydroxyl anions with helium [2]. Additionally, preliminary results of the influence of temperature on the inelastic collision rate are shown. Finally the exothermic proton transfer reaction D⁻ + H₂ → HD + H⁻ with a barrier of about 0.33 eV [3] is analysed. Here we investigate whether this reaction may occur at low temperature via tunneling through this barrier.

[1] R. Wester, J.Phys.(2009); [2] D. Hauser Nat.Phys.(2015); [3] E. Haufler, J.Phys.Chem.(1997)