Berlin 2005 – wissenschaftliches Programm

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Q: Quantenoptik und Photonik

Q 20: Poster Fallen & Kühlung

Q 20.14: Poster

Montag, 7. März 2005, 11:00–12:30, Poster HU

Metastable Ca Atoms in a Magnetic Quadrupole - Ioffe Trap — •Dirk Hansen, Janis Mohr, Ciprian Zafiu, and Andreas Hemmerich — Institut für Laserphysik, Universität Hamburg, Luruper Chaussee 149, 22761 Hamburg

Alkaline-earth-metal atoms provide a unique combination of interesting spectroscopic features connected to their two valence electrons. The resulting singlet and triplet states offer strong principle fluorescence lines well suited for laser cooling as well as narrow-band intercombination transitions that can be used for refined laser cooling schemes. The metastable ³P₂, m_J=2 state is an interesting candidate for magnetic trapping and possibly the formation of a Bose-Einstein-Condensate (BEC); production of magnetically trapped metastable samples at low temperatures was previously demonstrated in our group [1-2].

In this poster we report on current developments of the experiment: optimized loading of the magnetic quadrupole trap, transfer into a tight Joffe-Pritchard trap, forced RF-evaporation. The prospects of reaching BEC through evaporative cooling are discussed and compared to recent theoretical results [3-4] on the scattering properties of Calcium.

[1] J. Grünert, S. Ritter, and A. Hemmerich, Phys. Rev. A 65, 041401(R) (2002)

[2] D. Hansen, J. Mohr, A. Hemmerich, Phys. Rev. A 67, 021401(R) (2003)

[3] V. Kokoouline, R. Santra, and C. H. Greene, Phys. Rev. Lett. 90, 253201 (2003)

[4] A. Derevianko, Phys. Rev. Lett. 87, 023002 (2001)