Frequency Metrology on Single Trapped Ions in the Weak Binding Limit: The 3s1/2−3p3/2 Transition in Mg+24
M. G. Herrmann, Valentin Batteiger, S. Knünz +3 more
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 400-fold improvement over previous results. Further, we find the excited state lifetime to be 3.84(10) ns.
arXiv:0808.4061•Physical Review Letters•Jan 9, 2009•63 citations