# Heidelberg 2015 – wissenschaftliches Programm

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# A: Fachverband Atomphysik

## A 17: Precision Measurements and Metrology IV (with Q)

### A 17.5: Vortrag

### Dienstag, 24. März 2015, 15:30–15:45, P/H1

**Magic wavelength for the clock transition in Magnesium-24** — •Dominika Fim, André Kulosa, Steffen Rühmann, Klaus Zipfel, Nandan Jha, Steffen Sauer, Wolfgang Ertmer, and Ernst M. Rasel — Gottfried Wilhelm Leibniz Universität

For this purpose we trap 10^{4} magnesium-24 atoms in a power enhanced linear optical lattice near the magic wavelength. We succeeded to directly excite the spin forbidden clock transition ^{1}*S*_{0} →^{3}*P*_{0} by using the magnetic field induced spectroscopy [1]. The interrogation laser has an instability of 5 · 10^{−16} at 1 s. A spectroscopy of the blue and red sideband and the carrier give access to important parameters. First, a measurement of the shift of the carrier frequency as a function of trap depth gives insight in the differential AC stark shift. Here from we could determine the magic wavelength to 468.4(0.1) *nm* which is in a good agreement with theoretical calculations. By means of the difference in height of the sidebands we could evaluate the temperature of the atoms to 7 µ *K*.

Currently, we are investigating systematic shifts of the clock transition (e.g. 2nd order Zeeman shift).

[1] A. V. Taichenachev et al., Phys. Rev. Lett. 96, 083001 (2006)