Collinear Laser Spectroscopy of 2 ^{3}S_{1}→2 ^{3}P_{J} Transitions in Helium-like ^{12}C^{4+}

P Imgram; K König; B Maaß; P Müller; W Nörtershäuser

doi:10.1103/PhysRevLett.131.243001

Collinear Laser Spectroscopy of 2 ^{3}S_{1}→2 ^{3}P_{J} Transitions in Helium-like ^{12}C^{4+}

Phys Rev Lett. 2023 Dec 15;131(24):243001. doi: 10.1103/PhysRevLett.131.243001.

Authors

P Imgram¹, K König^{1

2}, B Maaß¹, P Müller¹, W Nörtershäuser^{1

2}

Affiliations

¹ Institut für Kernphysik, Departement of Physics, Technische Universität Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany.
² Helmholtz Research Academy Hesse for FAIR, Campus Darmstadt, Schlossgartenstraße 9, 64289 Darmstadt, Germany.

PMID: 38181159
DOI: 10.1103/PhysRevLett.131.243001

Abstract

Transition frequencies and fine-structure splittings of the 2 ^{3}S_{1}→2 ^{3}P_{J} transitions in helium-like ^{12}C^{4+} were measured by collinear laser spectroscopy on a 1-ppb level. Accuracy is increased by more than 3 orders of magnitude with respect to previous measurements, enabling tests of recent nonrelativistic (NR) QED calculations including terms up to mα^{7}. Deviations between the theoretical and experimental values are within theoretical uncertainties and are ascribed to mα^{8} and higher-order contributions in the series expansion of the NR QED calculations. Finally, prospects for an all-optical charge radius determination of light isotopes are evaluated.