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Stabilization of positronium by laser fields

par Karlson, Antonella ;Mittleman, Marvin
Référence Journal of Physics. B, Atomic Molecular and Optical Physics, 29, 20, page (4609-4623)
Publication Publié, 1996-10

Article révisé par les pairs

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Résumé :

We consider the problem of a positronium atom interacting with one or two laser fields with the goal of extending its lifetime. Ps annihilates essentially only from S states, so the lasers are used to populate the excited P and D states. The coherent trapping phenomenon yields a state which can be arranged to have no S components and is therefore stable against annihilation. Additional phenomena such as resonance, fluorescence and ionization repopulate the S state and destroy the absolute stability. We find that the net result is an optimal extention of the lifetime by about a factor of 2 for the three-state triplet case and 20 for the three-state singlet case.