Excited-State Magnetic Properties of Carbon-like Ca^{14+}

authored by: Lukas J. Spieß, Shuying Chen, Alexander Wilzewski, Malte Wehrheim, Jan Gilles, Andrey Surzhykov, Erik Benkler, Melina Filzinger, Martin Steinel, Nils Huntemann, Charles Cheung, Sergey G. Porsev, Andrey I. Bondarev, Marianna S. Safronova, José R. Crespo López-Urrutia, Piet O. Schmidt
Abstract: We measured the g-factor of the excited-state ^{3}P_{1} in Ca^{14+} ion to be g=1.499032(6) with a relative uncertainty of 4×10^{-6}. The magnetic field magnitude is derived from the Zeeman splitting of a Be^{+} ion, cotrapped in the same linear Paul trap as the highly charged Ca^{14+} ion. Furthermore, we experimentally determined the second-order Zeeman coefficient C_{2} of the ^{3}P_{0}-^{3}P_{1} clock transition. For the m_{J}=0→m_{J^{'}}=0 transition, we obtained C_{2}=0.39±0.04 Hz mT^{-2}, which is to our knowledge the smallest reported for any atomic transition to date. This confirms the predicted low sensitivity of highly charged ions to higher-order Zeeman effects, making them ideal candidates for high-precision optical clocks. Comparison of the experimental results with our state-of-the art electronic structure calculations shows good agreement and demonstrates the significance of the frequency-dependent Breit contribution, negative energy states, and QED effects on magnetic moments.
Organisation(s): Institute of Quantum Optics
External Organisation(s): Physikalisch-Technische Bundesanstalt PTB
Technische Universität Braunschweig
University of Delaware
Helmholtz Institute Jena
GSI Helmholtz Centre for Heavy Ion Research
Max Planck Institute for Nuclear Physics
Type: Article
Journal: Physical review letters
Volume: 135
Pages: 43002
No. of pages: 1
ISSN: 0031-9007
Publication date: 22.07.2025
Publication status: Published
Peer reviewed: Yes
ASJC Scopus subject areas: General Physics and Astronomy
Electronic version(s): https://doi.org/10.1103/p88p-brnx (Access: Open)

BibTeX

@article{c3c5116912b4401a9b8f29df88df2a77,
title = "Excited-State Magnetic Properties of Carbon-like Ca^{14+}",
abstract = "We measured the g-factor of the excited-state ^{3}P_{1} in Ca^{14+} ion to be g=1.499032(6) with a relative uncertainty of 4×10^{-6}. The magnetic field magnitude is derived from the Zeeman splitting of a Be^{+} ion, cotrapped in the same linear Paul trap as the highly charged Ca^{14+} ion. Furthermore, we experimentally determined the second-order Zeeman coefficient C_{2} of the ^{3}P_{0}-^{3}P_{1} clock transition. For the m_{J}=0→m_{J^{'}}=0 transition, we obtained C_{2}=0.39±0.04 Hz mT^{-2}, which is to our knowledge the smallest reported for any atomic transition to date. This confirms the predicted low sensitivity of highly charged ions to higher-order Zeeman effects, making them ideal candidates for high-precision optical clocks. Comparison of the experimental results with our state-of-the art electronic structure calculations shows good agreement and demonstrates the significance of the frequency-dependent Breit contribution, negative energy states, and QED effects on magnetic moments.",
author = "Spie{\ss}, {Lukas J.} and Shuying Chen and Alexander Wilzewski and Malte Wehrheim and Jan Gilles and Andrey Surzhykov and Erik Benkler and Melina Filzinger and Martin Steinel and Nils Huntemann and Charles Cheung and Porsev, {Sergey G.} and Bondarev, {Andrey I.} and Safronova, {Marianna S.} and {Crespo L{\'o}pez-Urrutia}, {Jos{\'e} R.} and Schmidt, {Piet O.}",
note = "{\textcopyright} This record is sourced from MEDLINE/PubMed, a database of the U.S. National Library of Medicine",
year = "2025",
month = jul,
day = "22",
doi = "10.1103/p88p-brnx",
language = "English",
volume = "135",
pages = "43002",
journal = "Physical review letters",
issn = "0031-9007",
publisher = "American Physical Society",
number = "4",
}