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MS: Fachverband Massenspektrometrie

MS 1: Resonance Ionization Spectroscopy / Mass Spectrometry

MS 1.4: Vortrag

Montag, 2. März 2026, 12:30–12:45, N 6

In-gas-jet Resonance Ionization Laser Spectroscopy with JetRIS — •Julian Hindermann for the JetRIS Collaboration collaboration — GSI, Darmstadt, Germany — HIM, Mainz, Germany — JGU Mainz, Germany

Nuclear shell effects stabilize nuclei beyond Z>103 against spontaneous fission. With increasing Z, also the electron shells are modified due to relativistic effects, QED effects and electron correlations. Probing atomic spectra with laser spectroscopy can reveal atomic information from energy, position and lifetime of an electronic state. Furthermore, it enables the determination of isotope shifts and hyperfine splittings to infer nuclear properties.

The heaviest nuclides are produced in limited quantities, requiring efficient tools for their studies. Within our collaboration, Resonance Ionization Laser Spectroscopy (RIS) is employed providing high selectivity and high sensitivity. Here, a tunable laser probes electronic transitions in the investigated atom. A second laser then ionizes the excited atom. The resulting laser ions are detected - leading to a resonance profile when the laser is tuned around the transition frequency. In the JetRIS setup, RIS is performed in a low-density and low-temperature supersonic gas jet. This enables higher spectral resolution measurements, as Doppler and pressure broadening are significantly reduced compared to in-gas cell methods.

This talk will discuss the status of the apparatus and address the long-discussed configuration of the 8⁻ K-isomer of ^254mNo that was recently determined using the JetRIS setup.

Keywords: Superheavy Elements; Laser Spectroscopy; JetRIS; Resonance Ionization Spectroscopy; Atomic Spectra