Abstract
The sensitive RAdiation Detected Resonance Ionization Spectroscopy (RADRIS) technique enabled the study of the atomic structure of the element nobelium (No, Z = 102) for the first time. The prospect of accessing the next element, lawrencium (Lr, Z = 103), depends on the efficiency and speed of evaporation of sample atoms from a filament catcher. To determine the desorption properties with respect to the requirements for the RADRIS technique, an off-line set-up to characterize filament catchers was developed. Using the iso-electronic homologue lutetium (Lu, Z= 71) different filament materials were studied with respect to the required desorption temperatures and the background from surface ionization.
Highlights
Due to relativistic effects in the atomic electron shell of heavy atomic systems, e.g., the configuration of the atomic ground state in lawrencium (Lr, Z=103) is expected to differ from the iso-electronic homologue lutetium (Lu, Z=71) [18]
To probe the atomic shell structure of the heaviest actinides with Z >100, the sensitive RAdiation Detected Resonance Ionization Spectroscopy (RADRIS) technique [10] is applied at the SHIP velocity filter [15] at the GSI facility in Darmstadt, Germany
For nobelium and radioactive ytterbium isotopes adsorbed onto a tantalum filament a temperature of about
Summary
Due to relativistic effects in the atomic electron shell of heavy atomic systems, e.g., the configuration of the atomic ground state in lawrencium (Lr, Z=103) is expected to differ from the iso-electronic homologue lutetium (Lu, Z=71) [18]. A precise determination of the first ionization potential or a hyperfine structure measurement will help to unambiguously characterize the atomic ground state of Lr, that has only been inferred indirectly. To probe the atomic shell structure of the heaviest actinides with Z >100, the sensitive RAdiation Detected Resonance Ionization Spectroscopy (RADRIS) technique [10] is applied at the SHIP velocity filter [15] at the GSI facility in Darmstadt, Germany. This article is part of the Topical Collection on Proceedings of PLATAN 2019, 1st International Conference, Merger of the Poznan Meeting on Lasers and Trapping Devices in Atomic Nuclei Research and the International Conference on Laser Probing, Mainz, Germany 19-24 May 2019 Edited by Krassimira Marinova, Michael Block, Klaus D.A. Wendt and Magdalena Kowalska
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