Stuttgart 2012 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 13: Poster 1: Cold Molecules, Femtosecond Spectroscopy, Molecular Dynamics
MO 13.1: Poster
Dienstag, 13. März 2012, 16:30–19:00, Poster.IV
Towards Cold Ion-Radical Chemistry with Magnetically Decelerated Atoms — •Katrin Dulitz1, Chris J. Rennick1, Michael Motsch2, Hansjürg Schmutz2, Frédéric Merkt2, and Timothy P. Softley1 — 1Department of Chemistry, University of Oxford, Chemistry Research Laboratory, Mansfield Road, Oxford, OX1 3TA, United Kingdom — 2Laboratorium für Physikalische Chemie, ETH Zürich, CH-8093, Switzerland
Zeeman deceleration is an experimental technique in which inhomogeneous, pulsed magnetic fields are used to control the velocity of a supersonic beam. The method is based on the Zeeman interaction between paramagnetic particles and magnetic fields, enabling the deceleration of species like atomic hydrogen or molecular oxygen [1, 2]. We present the design of a 12-stage Zeeman decelerator for hydrogen atoms that can readily be integrated into an existing ion-trap setup [3] using a bent magnetic hexapole guide. This combined Zeeman decelerator - ion trap experiment will allow for experiments on cold ion-radical reactions, e. g., between H atoms and sympathetically cooled CO2+. An extended version of the decelerator will be used for the deceleration of deuterium atoms to study kinetic isotope effects in low-temperature ion-radical reactions. The work will contribute towards the understanding of chemical reactivity in the low-temperature regime and it will provide fundamental tests for chemical reaction theories.
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[2] E. Narevicius et al., Phys. Rev. A 77, 051401 (2008).
[3] S. Willitsch et al., Phys. Rev. Lett. 100, 043203 (2008).