Monte Carlo simulation demonstrates laser-assisted enhancement of positronium formation in Rydberg hydrogen collisions, indicating dipolar focusing can optimize exotic atom production.
We investigate the formation of positronium (Ps) in the presence of a linearly polarized infrared laser field, via the collision of positrons with Rydberg hydrogen atoms H(nH) where nH is the principal quantum number. We are using the classical trajectory Monte Carlo method (CTMC) which is justified for nH≥3. The hydrogen in excited states has an effective dipole moment which in the presence of a laser field leads to a dipolar focusing [H. B. Ambalampitiya et al., J. Phys. B: At. Mol. Opt. Phys. 57, 10LT01 (2024)]. Due to this effect, the Ps formation cross section is enhanced substantially as compared to the zero-field case. The degree of this enhancement is controlled by the positron velocity, laser frequency, and laser-field amplitude. The final-state distribution in Ps is much broader than in the zero-field case.
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Matfunjwa et al. (2025) studied this question.
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