Köln 2025 – scientific programme

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

MS: Fachverband Massenspektrometrie

MS 1: Heavy and Superheavy Elements

MS 1.5: Talk

Monday, March 10, 2025, 16:15–16:30, HS 2 Chemie

High precision laser ionisation spectroscopy with JetRIS at GSI — •Alexandre Brizard for the SHE Laser collaboration — GANIL, CEA/DRF-CNRS/IN2P3, Caen, France

Resonance Ionization Spectroscopy (RIS) probes the atomic structure through multi-step laser ionization of neutralised atoms. When performed in a hypersonic gas jet, the technique's precision is enhanced by minimizing Doppler and pressure broadening [1].

At the SHIP velocity filter at GSI, JetRIS utilizes ion guiding and filament neutralization to inject the fusion products into the gas jet [2]. The photoions are studied using an alpha detector for efficient detection with low background. Future upgrades include an MR-ToF-MS, enabling mass-selected ion detection and access to long-lived as well as beta-decaying nuclides.

Following online commissioning in 2022, which revealed a transport efficiency of about 0.2% [3], significant effort has been put in improving the extraction and neutralisation of ions from the stopping gas cell. This work is being carried out in collaboration with KU Leuven.

Here we present the latest developments on the setup in preparation for the beamtime in February 2025.

[1] R. Ferrer et al., Nat Commun, 8, 14520 (2017)

[2] S. Raeder et al., NIMB, 463, 272-276 (2020)

[3] J. Lantis et al., Phys. Rev. Research 6, 023318 (2024)

Keywords: Laser spectroscopy; Gas jet; Super heavy elements