Heidelberg 2015 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 16: Posters 3: Novelties in Molecular Physics

MO 16.14: Poster

Mittwoch, 25. März 2015, 17:00–19:00, C/Foyer

Diagnostics of translational energy distribution of ions in 22 pole trap. — •Olga Lakhmanskaya, Thorsten Best, Sunil Kumar, Eric Endres, Daniel Hauser, and Roland Wester — Institute for Ion Physics and Applied Physics, University of Innsbruck, 6020 Innsbruck, Austria

Today the study of ion-molecule reactions moves towards cold chemistry which implies well-controlled ion ensembles and environment. The storage and preparation of ions by buffer gas cooling in multiple rf ion traps (such as: 16 or 22 pole) is a well established and robust technique. Nevertheless, a number of authors reveal the discrepancy between ion translational temperature and buffer gas temperature and the assignment of the temperature to the ion ansamble stay challenging. Here we present an experimental technique for diagnostics of highly energetic ions (OH⁻ and D⁻) in the trap (22 pole trap in our case). This scheme is based on the strong dependence of the lifetime of the ions on buffer gas temperature. It reveals a cutoff temperature of 20-25 K when the losses of ions terminates and therefore ion energy distribution should stay constant. Simulations of the ion distribution in the 22 pole trap help to shed lite on the translational energy distribution of ions in the trap. [1] O. Y. Lakhmanskaya et al., Int. J. Mass. Spectrom., 365, 281, 2014