Berlin 2014 – scientific programme
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A: Fachverband Atomphysik
A 14: Poster: Precision spectroscopy of atoms and ions (with Q)
A 14.3: Poster
Monday, March 17, 2014, 16:30–18:30, Spree-Palais
Optical Clock Based on a Single Trapped Ra+ Ion — •Mayerlin Nunez Portela, Elwin A. Dijck, Amita Mohanty, Nivedya Valappol, Oliver Boell, Klaus Jungmann, Cornelis J. G Onderwater, Sophie Schlesser, Rob G. E. Timmermans, Lorenz Wilmann, and Hans W. Wilschut — University of Groningen, FWN, Zernikelaan 25, NL-9747AA Groningen
Currently single-ion based optical clocks provide the most accurate frequency standards with their stability exceeding that of the latest cesium standards. The ultra-narrow electric quadrupole transitions 7s 2S1/2-6d 2D3/2 at 828 nm and 7s 2S1/2-6d 2D5/2 at 728 nm from the ground state to the low lying metastable D-state of Ra+ are excellently suited for a stable and accurate clock [1]. An important advantage of Ra+ is that all required optical wavelengths are available from semiconductor diode lasers. This promises a low-cost and compact setup. Fractional frequency uncertainty of 10−18 can be reached using a single Ra+ ion. We note that for radium isotopes with nuclear spin 3/2 the electric quadrupole shift can be largely canceled. We report the status of the project and its integration into a optical fiber linked clock network.
[1] O.O.Versolato et al., Phys. Rev. A 83, 043829 (2011)