Stuttgart 2012 – wissenschaftliches Programm
Q 52.1: Vortrag
Donnerstag, 15. März 2012, 14:00–14:15, V47.03
Towards Precision Spectroscopy of Cold Highly Charged Ions — •Oscar O. Versolato1, Maria Schwarz1, Alexander Windberger1, José R. Crespo López-Urrutia1, Alexander D. Gingell2, Anders K. Hansen2, Magnus A. Sørensen2, Michael Drewsen2, Piet O. Schmidt3, and Joachim Ullrich1 — 1Max-Planck-Institut für Kernphysik, Heidelberg, Germany — 2University of Aarhus, Aarhus, Denmark — 3Physikalisch-Technische Bundesanstalt Braunschweig and Leibniz Universität Hannover
Forbidden optical transitions in highly charged ions (HCIs) are excellent candidates for high stability frequency standards due to their low susceptibility to external fields. Certain lines in HCIs can be used to probe the the hypothesized time evolution of fundamental constants due to a enhanced sensitivity to variations of the fine structure constant. However, such high accuracy experiments require HCIs at rest in space, i. e. they need to be trapped and cooled. A broad range of HCIs can be sympthetically cooled using a Be+ ion cloud trapped in a Paul trap if the ratio of charge over mass is similar to that of the co-trapped Be+ ions. A laser system at 313 nm wavelength for laser cooling of Be+ ions has been constructed towards this end. Our 4 K cryogenic linear Paul trap CryPTEx has been commissioned successfully, trapping rovibrationally cold molecular ions (MgH+) in collaboration with the QUANTOP group in Aarhus. A proof-of-principle experiment on the 2P3/2-2P1/2 (M1) transition at 441 nm in boron-like Ar13+ is currently being set up, using CryPTEx in combination with the electron beam ion traps (EBITs) at MPIK Heidelberg to produce HCIs.