Rostock 2019 – wissenschaftliches Programm
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MO: Fachverband Molekülphysik
MO 10: Posters 1: Cold Molecules, High Resolution Spectroscopy, and Theory
MO 10.5: Poster
Dienstag, 12. März 2019, 16:30–18:30, S Foyer LLM
Sympathectic cooling and quatum state dependant reactions of molecular anions by a localized laser-cooled buffer gas — •Eric Endres1, Jonas Tauch1, Saba Hassan1, Markus Nötzold2, Bastian Höltkemeier1, Henry Lopez1, Roland Wester2, and Matthias Weidemüller1 — 1Physikalisches Institut Heidelberg, INF 226, 69120 Heidelberg — 2Institut für Ionenphysik und Angewandte Physik, Technikerstrasse 25/3, 6020 Innsbruck
Buffer gas cooling is a versatile technique to cool ions confined in a cryogenic radiofrequency ion traps[1]. However, it is limited to temperature of the coolant, typically being about 4K. By using a laser cold atom cloud, this limitation can be overcome. Furthermore, by localizing the atom cloud and/or a higher order radio frequency trap, theoretical description predicts cooling beyond the critical atom to ion mass ratio [2, 3].
In this contribution I will present recent results of our hybrid atom-ion trap system [4], consisting of an 8-pole radio frequency wire trap confining OH− and a dark spontaneous-force optical Rubidium trap [5]. By embedding ultra cold atoms in an ion cloud, three kind of collisions can occur. First, elastic collisions leading to cooling of the external degrees of freedom from the hydroxy anion, second inelastic collisions leading to cooling of the internal degrees of freedom. Finally, reactive collisions, namely associative detachment reactions, leading to a loss of the trapped anion.
First sings of sympathetic cooling will be shown, as well as, reactive collisions depending on the quantum state of the Rubidium atoms.