Hannover 2013 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 43: Precision spectroscopy of atoms and ions VI (with Q)
A 43.4: Vortrag
Freitag, 22. März 2013, 12:00–12:15, B 305
Optical spectroscopy on Ir17+ for the determination of transitions extremly sensitive on a variation of the fine-structure constant — •Alexander Windberger1, Hendrik Bekker1, Christian Beilmann2, Renee Klawitter3, Piet O. Schmidt4,5, Oscar O. Versolato1, and José R. Crespo López-Urrutia1 — 1Max-Planck-Institut für Kernphysik — 2Karlsruher Institut für Technologie — 3Tri University Meson Facility — 4Physikalisch-Technische Bundesanstalt — 5Leibniz Universität Hannover
The fine-structure constant α is closely related to fundamental physics. Thus, a temporal variation would point towards physics beyond the Standard Model. Evidence for a variation α/α≈ 10−19/year has been claimed by [1] based on astronomical observations. In order to test this claim in a laboratory experiment, two accurate ion clocks can be compared to search for a drift in α-sensitive clock transitions. Moving from singly charged to highly charged ions can enhance, both, the clock accuracy, and the α-sensitivity to meet the requirements. Particularly, the highest sensitivity for α ever predicted for a stable atomic system is found in Ir17+ by [2]. To determine the wavelength of the predicted transitions accurately, optical spectroscopy on Ir17+ is performed inside the Heidelberg electron beam ion trap (EBIT) at a ppm accuracy level. This will allow for future precision experiments, where Ir17+ will be transfered from an EBIT into the Cryogenic Paul Trap Experiment (CryPTEx).
[1] J. K. Webb et al., Phys. Rev. Lett. 107, 191101 (2011).
[2]J. C. Berengut et al., Phys. Rev. Lett. 106, 210802 (2011).