Berlin 2014 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 14: Poster: Precision spectroscopy of atoms and ions (with Q)

A 14.2: Poster

Montag, 17. März 2014, 16:30–18:30, Spree-Palais

Towards Laser Cooling of Negative Ions — •Elena Jordan, Giovanni Cerchiari, and Alban Kellerbauer — Max Planck Institut für Kernphysik, Heidelberg

Ultra-cold negative ions could be used in a wide field of applications. We want to demonstrate the first laser cooling of atomic anions. In order to identify suitable negative ions we study them with high-resolution laser spectroscopy. Previously the transition frequencies and transition cross-sections of anions of various Os isotopes have been determined. The hyperfine structure (where applicable) and the isotope shift were resolved, and the Zeeman splitting in a magnetic field was measured. These measurements have shown that laser cooling of Os⁻ is possible in principle, but at a low cooling transition rate. Therefore we are presently investigating La⁻ with high-resolution laser spectroscopy, as another potential candidate for anion laser cooling.