SAMOP 2021 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 2: Precision spectroscopy of atoms and ions (joint session A/Q)

A 2.2: Poster

Montag, 20. September 2021, 16:30–18:30, P

Electronic structure of superheavy element ions from ab initio calculations — •Harry Ramanantoanina¹, Anastasia Borschevsky², Michael Block³, and Mustapha Laatiaoui¹ — ¹Johannes Gutenberg-Universität Mainz, Deutschland — ²University of Groningen, The Netherlands — ³GSI Helmholtzzentrum für Schwerionenforschung Darmstadt, Deutschland

Within the framework of the recent Laser Resonance Chromatography (LRC) project, we are developing a theoretical approach to study the properties of superheavy elements ions. In this context, we use a fully relativistic model based on the 4-component Dirac Hamiltonian and multireference configuration interaction method to deal with the electronic structure and spectroscopic properties. In this presentation, we are reporting our first results of Lr+ (Z = 103), Rf+ (Z = 104) and Db+ (Z = 105). To validate the theoretical method, we have also calculated the energy spectrum of Lu+, Hf+ and Ta+, which are the lighter element homologue of the investigated superheavy ions, and we have compared the theoretical results with experimental data. Overall, the calculated energy levels and spectroscopic properties were in good agreement with the experimental data, confirming the suitability of the theoretical approach for this study and allowing us to expect good quality of the prediction for superheavy ions. The theoretical results are further discussed in terms of optical pumping schemes of metastable electronic states of the superheavy ions, very relevant for setting up future LRC experiments. This study is supported by the European Research Council (ERC) (Grant Agreement No. 819957).