Heidelberg 2015 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 72: Precision Spectroscopy of Atoms and Ions IV (with A)

Q 72.3: Vortrag

Freitag, 27. März 2015, 11:30–11:45, C/kHS

Identification of optical transitions in Ir¹⁷⁺ ions with high sensitivity to a variation of the fine-structure constant — •Alexander Windberger¹, Oscar O. Versolato^2,3, Hendrik Bekker¹, Natalia S. Oreshkina¹, Julian C. Berengut⁴, Anastasia Borschevsky⁵, Victor Bock¹, Zoltán Harman¹, Sebastian Kaul¹, Ulyana I. Safronova⁶, Victor V. Flambaum⁴, Christoph H. Keitel¹, Piet O. Schmidt^2,7, Joachim Ullrich^1,2, and José R. Crespo López-Urrutia¹ — ¹Max-Planck-Institut für Kernphysik — ²Physikalisch-Technische Bundesanstalt — ³Advanced Research for Nanolithography — ⁴University of New South Wales — ⁵GSI Helmholtzzentrum für Schwerionenforschung, — ⁶University of Nevada — ⁷Leibniz Universität Hannover

The unique electronic structure of the Nd-like Ir¹⁷⁺ ion allows for optical transitions of interest for metrology and the investigation of a possible variation of the fine-structure constant α. We performed spectroscopy in the optical range on Ir¹⁷⁺ ions produced and trapped in an electron beam ion trap (EBIT). Complex electron correlations in Ir¹⁷⁺ impede accurate theoretical predictions making a direct identification of transitions impossible. In a different approach, we investigated the characteristic energy scaling of fine-structure transitions with the atomic number Z. In the obtained spectra of the isoelectronic Nd-like W¹⁴⁺, Re¹⁵⁺, Os¹⁶⁺, and Pt¹⁸⁺, we identified 45 transitions contributing to these energy scalings. To confirm this method, the established transitions in Ir¹⁷⁺ were independently identified via their Zeeman-structures in the magnetic field of the EBIT.