https://doi.org/10.1140/epjd/s10053-022-00383-w
Regular Article - Atomic and Molecular Collisions
Low-energy electron elastic scattering by 
—modified effective range analysis
Institute of Physics, Faculty of Physics, Astronomy and Informatics, Nicolaus Copernicus University, Grudziadzka 5/7, 87-100, Toruń, Poland
Received:
15
December
2021
Accepted:
8
March
2022
Published online:
19
March
2022
Cross sections for electron elastic scattering on sulfur hexafluoride () are analyzed at ultra-low energies (below 1eV) using the semi-analytical approach to the modified effective range theory (MERT). It is shown that currently available experimental elastic cross sections are consistent with each other within the frame of this theoretical approach in the energy range 0.2–1 eV, i.e., when the coupling of elastic and electron attachment channels is relatively low. The MERT analysis also indicates the presence of the Ramsauer–Townsend effect in p-wave around 0.5 eV. To describe cross sections at energies lower than 0.2 eV, where the electron attachment plays a significant role, MERT is combined with the simple coupled model (SCM). The partial wave phase shifts extrapolated towards the zero energy suggest a virtual state scattering. The comparison between MERT and SCM results allows estimating the importance of the channel coupling effect at near-zero energies.
© The Author(s), under exclusive licence to EDP Sciences, SIF and Springer-Verlag GmbH Germany, part of Springer Nature 2022
