Berlin 2001 – wissenschaftliches Programm

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A: Atomphysik

A 10: Posters Wednesday (Cooling and Trapping, Electron Scattering and Recombination)

A 10.30: Poster

Mittwoch, 4. April 2001, 12:30–15:00, AT3

Laser–stimulated recombination in a combined trap — •Anette Pahl, Birgit Schatz, Jochen Walz und Theodor W. Hänsch — Max–Planck–Institut für Quantenoptik, Hans–Kopfermann–Str. 1, 85748 Garching

A promising mechanism to produce cold antihydrogen is based on laser–stimulated recombination [1] of antiprotons and positrons. For this purpose these particles, which have opposite charge and very different mass have to share the same volume. Two kinds of electromagnetic traps, which even confine these particles have been proposed for that: nested Penning traps [2] and the combined trap [3]. The advantage of the combined trap is that the particle clouds overlap.
The estimated rate for spontaneous recombination is small. A mode–locked Ti:Sapphire laser at 820 nm can stimulate the recombination into the n=3 level of the antihydrogen atom and thus enhance the recombination rate [4]. We plan to investigate laser–stimulated recombination of electrons and protons in a combined trap.

[1] A. Wolf, in: Recombination of Atomic Ions, ed. by W.G. Graham et al. NATO ASI Ser. B 296 (Plenum, New York, 1992), 209

[2] D.S. Hall and G. Gabrielse, Phys. Rev. Lett. 77 (1996) 1962

[3] J. Walz et al., Phys. Rev. Lett. 75 (1995) 3275

[4] L.A. Melnikov et al, Phys. of Atomic and Nuclei 11 (1998) 1928