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Published August 2019 | Published
Journal Article Open

Part-per-billion measurement of the 4^2S_(1/2)→3^2D_(5/2) electric-quadrupole-transition isotope shifts between ^(42,44,48)Ca^+ and ^(40)Ca^+

Abstract

We report a precise measurement of the isotope shifts in the 4^2S_(1/2)→3^2D_(5/2) electric quadrupole transition at 729 nm in ^(40−42,44,48)Ca^+. The measurement has been made via high-resolution laser spectroscopy of co-trapped ions, finding measured shifts of 2 771 872 467.6(7.6), 5 340 887 394.6(7.8), and 9 990 381 870.0(6.3) Hz between ^(42,44,48)Ca^+ and ^(40)Ca^+, respectively. By exciting the two isotopes simultaneously, using frequency sidebands derived from a single laser, systematic uncertainties resulting from laser frequency drifts are eliminated. This permits far greater precision than similar previously published measurements in other alkaline-earth-metal systems. The resulting measurement accuracy provides a benchmark for tests of theoretical isotope shift calculations and also offers a step towards probing new physics via isotope shift spectroscopy.

Additional Information

© 2019 American Physical Society. Received 10 June 2019; published 26 August 2019. We thank Cole Meisenhelder, Ariel Silbert, Sierra Jubin, and Sarah Stevenson, all of whom played essential roles in the assembly of the experiment, and Tiku Majumder for helpful conversations. This work was supported by the NSF under RUI Grant No. PHY-1707822 and by a Cottrell Scholar Award from the Research Corporation for Science Advancement.

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Published - PhysRevA.100.022514.pdf

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Created:
August 19, 2023
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October 18, 2023