Berlin 2014 – scientific programme

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A: Fachverband Atomphysik

A 9: Precision spectroscopy of atoms and ions II (with Q)

A 9.1: Talk

Monday, March 17, 2014, 14:00–14:15, BEBEL E42

Precision spectroscopy of atomic anions with a view to laser cooling — •Giovanni Cerchiari, Elena Jordan, and Alban Kellerbauer — MPIK, Heidelberg, Germany

We are investigating the electronic structure of negative atomic ions, looking for suitable bound-bound transitions to be used for laser cooling. Cooling of negative ions using electronic transitions has not yet been achieved and could open up the possibility to create negatively charged ensembles at fractions of Kelvin. Most atomic anions show only a single bound state. We are experimentally studying the few exceptions of this rule. Our spectroscopic studies are thus focused on the few atomic species with more than one bound state. We have completed a precise spectroscopic analysis of Os⁻ and are now probing La⁻ using similar experimental techniques. Methods of the measurements will be discussed in order to introduce the results achieved on atomic levels as well as transition rates and the energy splitting due to hyperfine and Zeeman effects.