Heidelberg 2015 – wissenschaftliches Programm
A 8.4: Poster
Montag, 23. März 2015, 17:00–19:00, C/Foyer
Photoionizing 174Yb+ to 174Yb2+ — •Martin Fischer1,2, Simon Heugel1,2, Vladimir Elmann1, Markus Sondermann1,2, and Gerd Leuchs1,2,3 — 1Max Planck Institute for the Science of Light, Erlangen, Germany — 2Friedrich-Alexander University Erlangen-Nürnberg (FAU), Department of Physics, Erlangen, Germany — 3Department of Physics, University of Ottawa, Canada
We report on the photoionization of 174Yb+ ions trapped inside a radio-frequency ion-trap. The photoionization is realized in a three-step scheme. In the second intermediate step the 4f147p1/2 level in 174Yb+ is excited via the transition from the 4f145d3/2 level with a cw-laser at 245 nm. Another photon at 245 nm finally provides the energy for the ionization. A laser at 976 nm is applied continuously in order to clear the long-lived 4f145d5/2 level. The photoionization is typically achieved with intensities of 10 W/cm2 at 245 nm. Effects from stray charges created by this laser can thereby be minimized. The 174Yb2+ ions are identified using crystallized mixed species ion-pairs: The effect of a 174Yb2+ ’guest’ ion onto the position of a 174Yb+ ’host’ ion as well as the motional resonance-frequencies of this two-ion crystal are detected, unambiguously indicating for the successful ionization.