Berlin 2014 – scientific programme
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A: Fachverband Atomphysik
A 14: Poster: Precision spectroscopy of atoms and ions (with Q)
A 14.25: Poster
Monday, March 17, 2014, 16:30–18:30, Spree-Palais
Towards quantum logic spectroscopy of highly charged ions — •Tobias Leopold1, Maria Schwarz1,3, Oscar Versolato1,3, Matthias Kohnen1, Alexander Windberger3, Lisa Schmöger1,3, Peter Micke1,3, Joachim Ullrich1, José Crespo Lopez-Urrutia3, and Piet Schmidt1,2 — 1Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 2Institut für Quantenoptik, Leibniz Universität Hannover, Hannover, Germany — 3Max-Planck-Institut für Kernphysik, Heidelberg, Germany
Highly charged ions (HCIs) are of special interest in high precision laser spectroscopy. Optical dipole (E1) forbidden transitions offer narrow linewidths perfectly suited for optical clocks. Due to high field strengths in the ions, their energy levels have a low sensitivity to external field shifts. A possible temporal change of the fine structure constant can be probed by spectroscopy of HCIs with unprecedented precision due to highly sensitive transitions.
Electron beam ion traps (EBITs) are an easy way to produce and trap HCIs. However, the trapping potential reaches several kiloelectronvolts so that the temperature of the trapped ions is too high for precision spectroscopy. As direct laser cooling is not applicable in HCIs, we combine an EBIT with a cryogenic linear Paul trap and sympathetically cool with Be+ ions.
Our aim is to perform quantum logic spectroscopy with Ir17+ as spectroscopy ion. The Be+ ion serves as cooling reservoir and readout of the HCI’s electronic state. That technique allows to resolve highly forbidden transitions to their natural linewidth.