Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 39: Precision spectroscopy of atoms and ions IV (with Q)

A 39.3: 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. Versolato2,3, 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. Schmidt2,7, Joachim Ullrich1,2, and José R. Crespo López-Urrutia11Max-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.

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