Hannover 2013 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 43: Precision spectroscopy of atoms and ions VI (with Q)

A 43.5: Vortrag

Freitag, 22. März 2013, 12:15–12:30, B 305

Towards Laser Cooling of Negative Ions — •Elena Jordan, Sophia Haude, Anke Heilmann, and Alban Kellerbauer — MPI für Kernphysik, Heidelberg

Ultra-cold negative ions could be used in a wide field of applications. We intend to demonstrate the first laser cooling of atomic anions. In order to identify suitable laser cooling transitions, we study negative ions by high-resolution laser spectroscopy. Previously the transition frequencies and transition cross-sections of various Os⁻ isotopes were determined [1]. The isotope shift and the hyperfine structure (where applicable) were resolved [2,3], and the Zeeman splitting in a magnetic field was measured [4]. These measurements have shown that laser cooling of Os⁻ is possible in principle, but is hampered by a low cooling transition rate. Presently we are pursuing high-resolution spectroscopy on La⁻, which has been identified as another potential candidate for anion laser cooling [5].

[1] U. Warring et al., Phys. Rev. Lett. 102 (2008) 043001.

[2] A. Fischer et al., Phys. Rev. Lett. 104 (2010) 073004.

[3] A. Kellerbauer et al., Phys. Rev. A 84 (2011) 062510.

[4] A. Kellerbauer et al., submitted to Phys. Rev. Lett.

[5] S. M. O’Malley & D. R. Beck, Phys. Rev. A 81 (2010) 032503.