Laser stimulated deexcitation of Rydberg antihydrogen atoms

Abstract

Antihydrogen atoms are routinely formed at CERN in a broad range of Rydberg states. Ground-state anti-atoms, 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 to stimulate, using a broadband frequency laser, the deexcitation toward low-lying states, which then spontaneously decay to ground-state. We evaluated 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 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.

arXiv comment10 pages

References in corpus (4)

• The Hydrogen Atom in Combined Electric and Magnetic Fields with Arbitrary Mutual Orientations
• Cross Section for Rydberg Antihydrogen Production via Charge Exchange Between Rydberg Positronium and Antiprotons in Magnetic Field
• The ASACUSA antihydrogen and hydrogen program : results and prospects
• Scaling behaviour of the ground-state antihydrogen yield from CTMC simulation as a function of positron density and temperature

Cited by in corpus (3)

• Stimulated decay and formation of antihydrogen atoms
• Induced THz transitions in Rydberg caesium atoms for application in antihydrogen experiments
• A Rydberg hydrogen beam for studies of stimulated deexcitation