Abstract
The positron-hydrogen collision system is considered with the one- and two-centre convergent close-coupling methods with a particular focus on initial excited states. The previous limitation on the two-centre method, restricting the Laguerre basis size, has been removed allowing for larger bases, which is necessary for the examination of the near-threshold cross section behaviour for three-body breakup. Excellent agreement with the Wannier–Klar predictions for these systems is found for initial states with principal quantum number \(n\le 3\). The accuracy of the presented cross sections is supported by demonstrating internal consistency of the one- and two-centre calculations.
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This manuscript has no associated data or the data will not be deposited. [Authors’ comment: Quantitative data presented in the figures may be obtained via an electronic scan, or requested from the lead author.]
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Acknowledgements
We gratefully acknowledge the financial support of the Australian Research Council, and the computational resources provided by the Pawsey Supercomputing Centre, with funding from the Australian Government and Government of Western Australia. We also acknowledge the Texas Advanced Computing Center (TACC) and the National Computing Infrastructure of Australia. IIF has been supported by the US National Science Foundation, Grant No. PHY-1803744.
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The lead author performed the calculations and wrote the original manuscript, the others contributed ranging from assisting with code development, develo** the underlying concepts through to reading and improving the manuscript.
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Bray, I., Kalinkin, I., Fursa, D.V. et al. Positron-hydrogen scattering: internal consistency and threshold behaviour for excited states. Eur. Phys. J. D 77, 194 (2023). https://doi.org/10.1140/epjd/s10053-023-00778-3
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DOI: https://doi.org/10.1140/epjd/s10053-023-00778-3