Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 8: Poster: Photoionization

A 8.4: Poster

Montag, 23. März 2015, 17:00–19:00, C/Foyer

Photoionizing ¹⁷⁴Yb⁺ to ¹⁷⁴Yb²⁺ — •Martin Fischer^1,2, Simon Heugel^1,2, Vladimir Elmann¹, Markus Sondermann^1,2, and Gerd Leuchs^1,2,3 — 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 4f¹⁴7p_1/2 level in ¹⁷⁴Yb⁺ is excited via the transition from the 4f¹⁴5d_3/2 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 4f¹⁴5d_5/2 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.