Dipolar focusing in laser-assisted positronium formation

We consider positronium formation in collisions of positrons with excited hydrogen atoms H( n ) in an infrared laser field theoretically. This process is assisted by the dipolar focusing effect: a positron moving in a superposition of a laser field and the dipolar field can approach the atomic targe...

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Bibliographic Details
Published in:Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2024-05, Vol.57 (10), p.10
Main Authors: Ambalampitiya, H B, Matfunjwa, M K, Fabrikant, I I
Format: Article
Language:English
Subjects:
antihydrogen
classical trajectory Monte Carlo
laser-assisted process
positronium
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Summary:We consider positronium formation in collisions of positrons with excited hydrogen atoms H( n ) in an infrared laser field theoretically. This process is assisted by the dipolar focusing effect: a positron moving in a superposition of a laser field and the dipolar field can approach the atomic target even if its trajectory starts with a very large impact parameter, leading to a significant enhancement of the Ps formation cross section. The classical trajectory Monte Carlo method, which is justified for n ⩾ 3 , allows efficient calculation of this enhancement. A similar effect can occur in collisions of positrons with other atoms in excited states, which can lead to improvements in the efficiency of positronium formation.
ISSN:0953-4075
1361-6455
DOI:10.1088/1361-6455/ad3f5a