https://doi.org/10.1140/epjd/s10053-023-00764-9
Regular Article – Atomic and Molecular Collisions
Elastic and inelastic cross sections for positron scattering from molecular oxygen
1
Departamento de Física, Universidade Federal do Espírito Santo, Vitória, ES, Brazil
2
Departamento de Física, Centro Federal de Educação Tecnológica de Minas Gerais, 30421-169, Belo Horizonte, MG, Brazil
3
Departamento de Física, Universidade Federal de Minas Gerais, 30123-970, Belo Horizonte, MG, Brazil
Received:
23
August
2023
Accepted:
30
September
2023
Published online:
24
October
2023
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 
. 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
target, although roughly three times greater than the last one. The rotational excitation cross sections for positron scattering from O are reported.
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