Laser-stimulated deexcitation of Rydberg antihydrogen atoms
Résumé
Antihydrogen atoms are routinely formed at CERN in a broad range of Rydberg states. Ground-state antiatoms, those useful for precision measurements, are eventually produced through spontaneous decay. However given the long lifetime of Rydberg states the number of ground-state antihydrogen atoms usable is small, in particular for experiments relying on the production of a beam of antihydrogen atoms. Therefore, it is of high interest to efficiently stimulate the decay in order to retain a higher fraction of ground-state atoms for measurements. We propose a method that optimally mixes the high angular momentum states with low ones enabling us to stimulate, using a broadband frequency laser, the deexcitation toward low-lying states, which then spontaneously decay to the ground state. We evaluate the method in realistic antihydrogen experimental conditions. For instance, starting with an initial distribution of atoms within the n = 20-30 manifolds, as formed through the charge exchange mechanism, we show that more than 80% of antihydrogen atoms will be deexcited to the ground state within 100 ns using a laser producing 2 J at 828 nm.
Domaines
Physique Atomique [physics.atom-ph]
Fichier principal
2019 Laser-stimulated deexcitation of Rydberg antihydrogen atoms Malbruno PRA.pdf (860.25 Ko)
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2019 Erratum Laser-stimulated deexcitation of Rydberg antihydrogen atoms Malbruno Comparat PRA.pdf (268.22 Ko)
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