SMuK 2023 – scientific programme

Parts | Days | Selection | Search | Updates | Downloads | Help

P: Fachverband Plasmaphysik

P 16: Plasma Wall Interaction II/Codes and Modeling I

P 16.4: Talk

Thursday, March 23, 2023, 15:00–15:15, CHE/0091

Hyperfine structure splitting and the Zeeman effect of ⁸³Kr in laser absorption spectroscopy investigated at the linear plasma device PSI-2 — •Marc Sackers¹, Oleksandr Marchuk¹, FNU Dipti², Stephan Ertmer¹, Yuri Ralchenko³, and Arkadi Kreter¹ — ¹Forschungszentrum Jülich GmbH - Institut für Energie- und Klimaforschung - Plasmaphysik, Partner of the Trilateral Euregio Cluster (TEC), 52425 Jülich, Germany — ²International Atomic Energy Agency, Vienna, Austria — ³National Institute of Standards and Technology - Atomic Spectroscopy Group, 20899 Gaithersburg, USA

Comparing Ar I and Kr I laser absorption spectra obtained at the linear plasma device PSI-2 indicate an additional line broadening in the case of Kr due to isotopic effects. The magnetic field configurations at PSI-2 provide weak field conditions for even numbered isotopes, i.e., a small perturbation on the energy level splitting. However, concerning ⁸³Kr, the magnetic field strength (B) is de facto intermediate. This condition substantially increases the complexity of the spectra since the energy shift is non-linear in B and the intensities of the magnetic sub-transitions depend on B as well.

The analysis is based on a model by C. G. Darwin of the Zeeman effect at all field strengths [1]. Overall, the experimental investigation at the linear plasma device PSI-2 is limited to laser absorption spectra (20.5 mT to 90 mT) from the Kr I 5s J=2 and J=0 metastable levels using the 760.15 nm and 785.48 nm lines, respectively.

[1] C. G. Darwin, Proc. R. Soc. Lond. A 115, 1-19 (1927)