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Q: Fachverband Quantenoptik und Photonik
Q 19: Precision Spectroscopy of Atoms and Ions II (joint session A/Q)
Q 19.1: Talk
Tuesday, March 7, 2023, 11:00–11:15, F303
Highly-sensitive photodetachment spectroscopy in an MR-ToF device — •Franziska Maria Maier1,2 and Erich Leistenschneider1 — 1ISOLDE/CERN — 2Universität Greifswald
For the MIRACLS and GANDALPH collaboration.
The electron affinity (EA) reflects the energy released when an electron is attached to a neutral atom. An experimental determination of this quantity serves as an important benchmark for atomic models describing electron-correlation effects [1]. However, the EA of several radioactive elements is still unknown and detailed information about isotope shifts or hyperfine splittings of EAs are only available for a handful of cases, mainly with modest precision.
Exploiting the low-energy version of the Multi Ion Reflection Apparatus for Collinear Laser Spectroscopy (MIRACLS) [2], we have initiated a high-precision measurement of the isotope shift in the electron affinity. By trapping ion bunches between the two electrostatic mirrors of MIRACLS multi-reflection time-of-flight (MR-ToF) device, the same ion bunch is probed by the spectroscopy laser repeatedly. Thus, the signal sensitivity is 3-4 orders of magnitude higher compared to conventional single-pass photodetachment experiments, see e.g. [1].
I will introduce the novel technique, present the first experimental results on Chlorine and discuss future possibilities of an MR-ToF device for highly sensitive and high-precision measurements of EAs for various radioactive samples.
[1] D. Leimbach et al., Nat Commun 11, 3824 (2020).
[2] S. Sels et al., Nucl. Instr. Meth. Phys. Res. B 463, 310 (2020).