Heidelberg 2015 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 4: Cold Molecules 1

MO 4.4: Vortrag

Montag, 23. März 2015, 15:15–15:30, PH/SR106

Rotational state-changing cold collisions of hydroxyl ions with helium — •Daniel Hauser, Seunghyun Lee, Fabio Carelli, Steffen Spieler, Olga Lakhmanskaya, Eric Endres, Sunil Kumar, Franco Gianturco, and Roland Wester — Institute for Ion Physics and Applied Physics, University of Innsbruck, 6020 Innsbruck, Austria

Sympathetic collisions with cold atoms and atomic ions are widely used to prepare translationally cold molecules and molecular ions. Inelastic collisions with neutral atoms have proven to be a general approach to cool internal degrees of freedom [1,2]. Here we present a new scheme to measure the absolute quantum scattering rate coefficients for the rotationally inelastic collision of hydroxyl anions and their deuterium-containing counterparts upon interaction with helium in a multipole radio-frequency ion trap. The measured rates and the ab initio quantum scattering calculations agree very well with each other. With the methods developed, improved quantum state-preparation of molecular ions for precision spectroscopy or quantum information research is achieved.

[1] R. Otto, A. von Zastrow, T. Best and R. Wester, 2013 Physical Chemistry Chemical Physics 15 612-618 (2013)

[2] A. K. Hansen, O. O. Versolato, L. Klosowski, S. B. Kristensen, A. Gingell, M. Schwarz, A. Windberger, J. Ullrich, J. R. C. Lopez-Urrutia, M. Drewsen, Nature 508, 76-79 (2014).