Abstract
A single Ra+ ion stored in a Paul radio frequency ion trap has excellent potential for a precision measurement of the electroweak mixing angle at low momentum transfer and as the most stable optical clock. The effective transport and cooling of singly charged ions of the isotopes 209Ra to 214Ra in a gas filled radio frequency quadrupole device is reported. The absolute frequencies of the transition 7s2S1/2–7d2D3/2 at wavelength 828 nm have been determined in 212–214Ra+ with ≤19 MHz uncertainty using laser spectroscopy on small samples of ions trapped in a linear Paul trap at the online facility Trapped Radioactive Isotopes: µicrolaboratories for fundamental Physics (TRIµP) of the Kernfysisch Versneller Instituut.
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Acknowledgments
This work is supported by the Foundation for Fundamental Research on Matter (FOM), which is part of the Netherlands Organisation for Scientific Research (NWO), under programme 114 TRIμ P, programme 125 Broken Mirrors & Drifting Constants and project 06PR2499 Parity violation in a single trapped ion as a probe of electroweak running. One of us (O.O.V.) acknowledges a top talent grant from NWO. We appreciate the excellent technical support of KVI staff, and we could draw in particular on the expertise of O. Böll, O. Dermois and L. Huisman.
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Nuñez Portela, M., Dijck, E.A., Mohanty, A. et al. Ra+ ion trapping: toward an atomic parity violation measurement and an optical clock. Appl. Phys. B 114, 173–182 (2014). https://doi.org/10.1007/s00340-013-5603-2
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DOI: https://doi.org/10.1007/s00340-013-5603-2