Heidelberg 2015 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 63: Poster: Precision Spectroscopy of Atoms and Ions (with A)
Q 63.18: Poster
Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer
Quantum Logic Spectroscopy of Highly Charged Ions — •Peter Micke1,2, Tobias Leopold1, Maria Schwarz1,2, Lisa Schmöger1,2, Oscar O. Versolato1,2, Joachim H. Ullrich1,2, José R. Crespo López-Urrutia2, and Piet O. Schmidt1,3 — 1Physikalisch-Technische Bundesanstalt, Braunschweig, Germany — 2Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 3Leibniz Universität Hannover, Germany
Highly charged ions (HCIs) offer forbidden optical transitions near level crossings due to reordering of the electronic levels as the charge state grows. Some of these transitions have an enhanced sensitivity to a possible variation of the fine-structure constant. Furthermore, HCIs are insensitive to external fields because of their strong internal Coulomb field. This can be exploited for building optical clocks with small systematic shifts. We are currently setting up an experiment for the Physikalisch–Technische Bundesanstalt aiming at quantum logic spectroscopy of HCIs. A novel compact EBIT based on permanent magnets breeds HCIs. Next, they are extracted, decelerated and injected into an ultra-stable cryogenic Paul trap. Generally, HCIs do not have transitions appropriate for direct laser cooling. However, they can be sympathetically cooled with another ion species – in our case Be+. Spectroscopic measurements can be carried out by using quantum logic: A single HCI is co-trapped together with a Be+ logic ion, which provides not only cooling, but also both state preparation and readout.