Physics – Quantum Physics
Scientific paper
2008-04-02
published on Physical Review A vol.78, p.052512 (2008)
Physics
Quantum Physics
18 pages, 4 figures; changed content (with erasing of section 2), adding a new figure and new references
Scientific paper
10.1103/PhysRevA.78.052512
Antihydrogen production by charge exchange reaction between Positronium (Ps) atoms and antiprotons requires an efficient excitation of Ps atoms up to high-n levels (Rydberg levels). In this study it is assumed that a Ps cloud is produced within a relatively strong uniform magnetic field (1 Tesla) and with a relatively high temperature (100 K). Consequently, the structure of energy levels are deeply modified by Zeeman and motional Stark effects. A two-step laser light excitation, the first one from ground to n=3 and the second from this level to a Rydberg level, is proposed and the physics of the problem is discussed. We derive a simple formula giving the absorption probability with substantially incoherent laser pulses. A 30% population deposition in high-$n$ states can be reached with feasible lasers suitably tailored in power and spectral bandwidth.
Boscolo Ilario
Castelli Fabio
Cialdi Simone
Comparat Daniel
Giammarchi Marco G.
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