Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 41: Ultra-cold atoms, ions and BEC V (with Q)

A 41.4: Vortrag

Freitag, 27. März 2015, 11:45–12:00, M/HS1

Sympathetic cooling of ions in radio frequency traps beyond the critical mass ratio — •Pascal Weckesser, Bastian Höltkemeier, Henry Lopez, and Matthias Weidemüller — Physikalisches Institut, Im Neuenheimer Feld 226, 69120 Heidelberg

Sympathetic cooling has become a powerful and universal method for preparing ultracold ions confined in radio frequency traps. We theoretically investigate the possibility of using laser-cooled atoms as a buffer gas. Recent theories indicate that cooling of ions in radio frequency traps is limited by the mass ratio of the coolant and the ion.

We present an approach to overcome the this mass ratio limitation. By performing Monte-Carlo simulations we find universal solutions for the ion’s steady state at all mass ratios. A detailed description of these solutions and the corresponding cooling limit for experimental applications will be presented.