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A: Fachverband Atomphysik
A 12: Precision Spectroscopy of Atoms and Ions II
A 12.4: Talk
Tuesday, March 3, 2009, 15:00–15:15, VMP 6 HS-C
Precision spectroscopy on weakly bound ions — •Maximilian Herrmann, Valentin Batteiger, Sebastian Knünz, Guido Saathoff, Thomas Udem, and Theodor W. Hänsch — Max-Planck-Institut für Quantenoptik, 85748 Garching, Deutschland
We demonstrate a method for precision spectroscopy on trapped ions in the limit of unresolved motional sidebands. By sympathetic cooling of a chain of crystallized ions we suppress adverse temperature variations induced by the spectroscopy laser that usually lead to a distorted line profile and obtain a Voigt profile with negligible distortions. We applied the method to measure the absolute frequency of the astrophysically relevant D2 transition in single 24Mg+ ions and find 1 072 082 934.33(16) MHz, a nearly 400fold improvement over previous results. Further, we find the excited state lifetime to be 3.84(10) ns.