Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 1: Ultra-cold atoms, ions and BEC I (with Q)

A 1.5: Vortrag

Montag, 17. März 2014, 11:30–11:45, BEBEL E34

Sympathetic cooling of ions in higher-order rf traps using laser-cooled atoms in a MOT — •Pascal Weckesser, Bastian Höltkemeier, Henry Lopez, Julian Glässel, and Matthias Weidemüller — Physikalisches Institut, Im Neuenheimerfeld 226, 69120 Heidelberg, Germany

Molecular ions are usually caught in a linear Paul trap and cooled sympathetically by He buffer gas. In order to reach lower temperatures for a wide range of molecular ions we investigate replacing He with laser-cooled atoms. Recent theories indicate that cooling in ion traps homogeneously filled with ultracold atoms is limited by the atom-ion mass ratio.

We derive that a localized cloud of ultracold atoms in higher order radio frequency traps overcomes the mentioned mass ratio limitation. A proper description of this local criterion and its features will be introduced.