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Lagrange-mesh calculations of S-wave resonances in three-body atomic systems

par Dohet-Eraly, Jérémy ;Servais, Jean
Référence Journal of Physics. B, Atomic Molecular and Optical Physics, 55, 24, 245001
Publication Publié, 2022-12-01

Article révisé par les pairs

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Résumé :

The Lagrange-mesh method is known to be an efficient tool for evaluating the bound states of various three-body atomic and molecular systems. By combining it with the complex scaling method, resonances can also be studied. In this paper, this approach is used for evaluating several S-wave resonances of the helium atom and of the negative positronium ion in vacuum and in Debye plasmas. In spite of its simplicity, the Lagrange-mesh method provides resonance energies and widths more accurate than the best literature results.