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A: Fachverband Atomphysik

A 25: Posters: Precision spectroscopy of atoms and ions

A 25.7: Poster

Donnerstag, 13. März 2008, 16:30–18:30, Poster C3

Towards Direct Frequency Comb Spectroscopy using Quantum Logic — •Börge Hemmerling, Lukas An der Lan, and Piet O. Schmidt — Institut für Experimentalphysik, Universität Innsbruck, Austria

A possible change of the fine-structure constant over cosmological time scales derived from quasar absorption lines is currently strongly debated. One of the difficulties turns out to be the lack of precise laboratory data on transition lines of elements with a complex level structure such as Ti⁺ and Fe⁺ [1].

We challenge this problem by developing a versatile experimental setup in which spectroscopy ions are sympathetically cooled by magnesium ions in a linear Paul trap. Using quantum logic techniques, initial state preparation and state detection of the spectroscopy ion can be very efficient. Owing to the complex level structure of these spectroscopy ions, repumping from unwanted states is required. We plan to implement this by applying an appropriately tailored optical frequency comb.

We will present the latest status of our experimental setup and simulation results on the expected fluorescence signal from a Ca⁺ test candidate. We furthermore present schemes based on quantum logic techniques to interrogate single ions in order to further improve the accuracy of the spectroscopic data.

[1] J. C. Berengut, V. A. Dzuba, V. V. Flambaum, M. V. Marchenko and J. K. Webb, arXiv:physics/0408017 (2006)