Bonn 2025 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 35: Precision Spectroscopy of Atoms and Ions III (joint session A/Q)

Q 35.7: Vortrag

Mittwoch, 12. März 2025, 12:45–13:00, HS PC

Collinear laser spectroscopy of helium-like ¹²⁻¹⁴C⁴⁺ — •Emily Burbach¹, Kristian König¹, Aaron Bondy², Gordon Drake², Phillip Imgram³, Patrick Müller⁴, Wilfried Nörtershäuser¹, Xiao-Qiu Qi⁵, and Julien Spahn¹ — ¹TU Darmstadt, Germany — ²University of Windsor, Canada — ³KU Leuven, Belgium — ⁴University of California, USA — ⁵Zhejiang Sci-Tech University, China

Light helium-like systems are ideal test cases for nuclear and atomic structure calculations as they exhibit a greatly varying nuclear structure and are accessible for high-precision ab-initio calculations. In an ongoing effort, it is planned to determine absolute and differential nuclear charge radii, R_C and δ ⟨ r² ⟩, of the light elements Be to N by purely using collinear laser spectroscopy and non-relativistic quantum electrodynamics calculations in the helium-like ions. As a first step, the 1s2s ³S₁ → 1s2s ³P_J transitions in ¹²⁻¹⁴C⁴⁺ were determined using the Collinear Apparatus for Laser Spectroscopy and Applied Science (COALA) at the Technical University of Darmstadt. In those measurements a significant splitting isotope shift (SIS) was observed. It is defined as the difference in fine-structure splittings between different isotopes of the same atom after averaging over the hyperfine structure. It is compared to the theoretical SIS, which is determined by the relativistic finite nuclear mass and recoil contributions to the energy [1], which provides a clear test of the experimental accuracy. This project is supported by DFG (Project-ID 279384907 - SFB 1245).

[1] L.-M. Wang et al. Phys. Rev. A 95, 032504 (2017).

Keywords: Collinear Laser Spectroscopy; Highly Charged Ions; Carbon; Splitting Isotope Shift