Heidelberg 2015 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 35: Poster: Precision spectroscopy of atoms and ions (with Q)

A 35.21: Poster

Donnerstag, 26. März 2015, 17:00–19:00, C/Foyer

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

We want to demonstrate the first direct laser cooling of negative ions in a Penning trap. For the cooling the hyperfine structure and the Zeeman splitting in the magnetic field of the trap need to be known. We carried out collinear ion beam spectroscopy and determined the transition frequencies in negative lanthanum ions with unprecedented precision. The transition cross sections of bound-bound transitions were measured. The transition studied in this work had been found potentially suitable for Doppler laser cooling both from theory and experiment [1,2,3]. Presently, lanthanum is the most promising candidate among the atomic negative ions.
Once one species of negative ions is cooled, any other species can be cooled sympathetically [4].

[1] C.W. Walter et al. Physical Review Letters 113, 063001 (2014)
  [2] S.M. O’Malley and D.R.Beck, Physical Review A 81, 032503 (2010)
  [3] L.Pan and D.R.Beck, Physical Review A 82, 014501 (2010)
  [4] A.Kellerbauer and J.Walz, New Journal of Physics 8, 45 (2006)