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Elastic and inelastic cross sections for positron scattering from molecular oxygen

  • Regular Article – Atomic and Molecular Collisions
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Abstract

Elastic, vibrational and rotational cross sections for positron scattering from molecular oxygen are reported within the close-coupling formalism, using a three-dimensional positron–target potential energy surface. The present elastic values show good agreement with a recently reported theoretical prediction and helps to better understand the observed discrepancies between theory and experiment for energies below \(1\,\textrm{eV}\). For energies up to the opening of the positronium channel, details of the elastic cross section are also discussed. The cross section for excitation of the fundamental vibrational mode shows a sharp onset at threshold followed by a peak, similar to the observed in our previous work for the N\(_2\) target, although roughly three times greater than the last one. The rotational excitation cross sections for positron scattering from O\(_2\) are reported.

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Data Availability Statement

This manuscript has associated data in a data repository. [Authors’ comment: All data generated or analyzed during this study are included in this published article.]

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Acknowledgements

We acknowledge financial support from the Brazilian agencies FAPES, CNPq and CAPES.

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Authors and Affiliations

  1. Departamento de Física, Universidade Federal do Espírito Santo, Vitória, ES, Brazil

    Jenifer G. Pinheiro & Denise Assafrão

  2. Departamento de Física, Centro Federal de Educação Tecnológica de Minas Gerais, Belo Horizonte, MG, 30421-169, Brazil

    Luis A. Poveda

  3. Departamento de Física, Universidade Federal de Minas Gerais, Belo Horizonte, MG, 30123-970, Brazil

    José R. Mohallem

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  1. Jenifer G. Pinheiro
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  2. Denise Assafrão
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Correspondence to Denise Assafrão.

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Pinheiro, J.G., Assafrão, D., Poveda, L.A. et al. Elastic and inelastic cross sections for positron scattering from molecular oxygen. Eur. Phys. J. D 77, 184 (2023). https://doi.org/10.1140/epjd/s10053-023-00764-9

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