Absolute Frequency Measurement of theCa<mml:none/>+<mml:mprescripts/><mml:none/>404s S1/2<mml:none/><mml:mprescripts/><mml:none/>2−3d D5/2<mml:none/><mml:mprescripts/><mml:none/>2Clock Transition

2008/06/09 by M. Chwalla, Michael Chwalla, J. Benhelm +20 · 7 citations
Physics and Astronomy · #Advanced Frequency and Time Standards #Atomic and Subatomic Physics Research #Cold Atom Physics and Bose-Einstein Condensates #physics.atom-ph

paper · pdf · doi:10.1103/physrevlett.102.023002

published as Phys. Rev. Lett. 102, 023002 (2009)

arxiv created 2008/06/09 · openalex publication_date 2009/01/13 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/07/30

Abstract

We report on the first absolute transition frequency measurement at the 10^\ensuremath-15 level with a single, laser-cooled ⁴⁰Ca⁺ ion in a linear Paul trap. For this measurement, a frequency comb is referenced to the transportable Cs atomic fountain clock of LNE-SYRTE and is used to measure the ⁴⁰Ca⁺ 4s ²S_1/2\ensuremath-3d ²D_5/2 electric-quadrupole transition frequency. After the correction of systematic shifts, the clock transition frequency \ensuremathν_Ca⁺=411 042 129 776 393.2(1.0) Hz is obtained, which corresponds to a fractional uncertainty within a factor of 3 of the Cs standard. In addition, we determine the Land'e g factor of the 3d²D_5/2 level to be g_5/2=1.200 334 0(3).

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