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High-resolution Doppler laser spectroscopy of the laser cooling candidate La-

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Jordan,  Elena Judith
Alban Kellerbauer - Emmy Noether Junior Research Group, Junior Research Groups, MPI for Nuclear Physics, Max Planck Society;

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Citation

Jordan, E. J. (2015). High-resolution Doppler laser spectroscopy of the laser cooling candidate La-. PhD Thesis, Ruprecht-Karls-Universität, Heidelberg.


Cite as: https://hdl.handle.net/11858/00-001M-0000-0029-4D2F-B
Abstract
The bound-bound transition from the 5d26s2 3Fe2 ground state to the 5d6s26p 3D° 2 excited state in negative lanthanum has been proposed as a candidate for laser cooling, which has not yet been achieved for negative ions. Anion laser cooling holds the potential to allow the production of ultracold ensembles of any negatively charged species. In this work the aforementioned transition was studied in a beam of negative La ions by high-resolution laser spectroscopy. The center-of-gravity frequency of the transition was measured to be 96.592 80(10) THz. Seven of the nine expected hyperfine structure resonances were resolved. The observed peaks were unambiguously assigned to the predicted hyperfine transitions by a fit. From the determined hyperfine structure for this transition it was concluded that only three lasers would be required to cool and re-pump all hyperfine levels. Furthermore, the observed relative transition amplitudes suggest that in resonance the transitions are saturated at a laser power of 45 Wm-2. A rough estimate of the transition cross section confirms that La- is a promising candidate for the first laser cooling of negative ions.