Hannover 2016 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 27: Precision spectroscopy of atoms and ions I (with Q)
A 27.4: Vortrag
Mittwoch, 2. März 2016, 15:30–15:45, f428
Investigation of Ir17+ as a sensitive detector of variation of the fine-structure constant — •Hendrik Bekker1, Alexander Windberger1, 2, Oscar O. Versolato2, Anastasia Borchevsky3, Natalia S. Oreshkina1, Julian C. Berengut4, Zoltán Harman1, Christoph H. Keitel1, and José R. Crespo López-Urrutia1 — 1Max-Planck-Institut für Kernphysik, Heidelberg — 2Advanced Research Center for Nanolithography, Amsterdam — 3Van Swinderen Institute for Particle Physics and Gravity, Groningen — 4University of New South Wales, Sydney
Many highly charged ions have been proposed for use in next generation optical clocks for metrology purposes. We aim at implementing one of the original proposals, to use Ir17+ to investigate variation of the fine-structure constant [1]. But as with all the proposed systems, theory is not capable of predicting the energy level structure to the precision required for laser spectroscopy. Therefore we investigated Ir17+ which we produced, trapped, and collisionally excited in the Heidelberg electron beam ion trap. The wavelengths of subsequent optical fluorescence light were determined at the ppm-level using a grating spectrometer. Direct identification of the 30 observed lines was not possible due to their dense spacing and uncertainties on the predictions. But by employing several other techniques we identified transitions important for future high-precision laser spectroscopy experiments. The identification techniques and additional new results will be presented.
[1] J. C. Berengut et al., Phys. Rev. Lett. 106, 210803 (2011)
[2] A. Windberger et al., Phys. Rev. Lett. 114, 150801 (2015)