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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^+

Knollmann, Felix W. and Patel, Ashay N. and Doret, S. Charles (2019) 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^+. Physical Review A, 100 (2). Art. No. 022514. ISSN 2469-9926.

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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.

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Doret, S. Charles0000-0002-6349-7064
Alternate Title:Part-per-billion measurement of the 42S1/2→32D5/2 electric-quadrupole-transition isotope shifts between 42,44,48Ca+ and 40Ca+
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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Cottrell Scholar of Research CorporationUNSPECIFIED
Issue or Number:2
Record Number:CaltechAUTHORS:20190826-100602646
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:98226
Deposited By: Tony Diaz
Deposited On:26 Aug 2019 17:22
Last Modified:03 Oct 2019 21:39

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