Erlangen 2018 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 5: Precision Spectrosocopy I - trapped ions (joint session A/Q)
Q 5.3: Talk
Monday, March 5, 2018, 11:15–11:30, K 1.016
Sympathetic cooling of OH- by a laser-cooled buffer gas — •Jonas Tauch1, Henry Lopez1, Jan Trautmann1, Bastian Höltkemeier1, Eric Endres1, Roland Wester3, and Matthias Weidemüller1,2 — 1Physikalisches Institut, Universität Heidelberg, Deutschland — 2University of Science and Technology of China, Shanghai Branch, Shanghai 201315, China — 3Institut f. Ionenphysik und angewandte Physik, Universität Innsbruck, Österreich
Sympathetic cooling has become a powerful and universal method for preparing ultracold ions confined in radio frequency traps. In the past few year there has been a large debate about the limitations of this method. We recently developed a theoretical description which predicts that this limitations can be overcome by a localized buffer gas cloud and/or a higher order radio frequency trap. In this talk I present the recent results of our hybrid trap system, consisting of an 8-pole radio frequency trap and a dark spontaneous-force optical Rubidium trap. For probing the temperature of the ions, in particular OH-, we apply photodetachment tomography and time-of-flight detection of ions extracted from the trap. Via photodetachement spectroscopy we can also detect the energy distribution in the internal degree of freedom. We observe first evidence for sympathetic cooling and deviations from a thermal distribution of the ions, as predicted by our theoretical model.