Polarization effects, shape resonances and bound states in low energy positron elastic scattering by Zinc and Cadmium vapours

Arretche, Felipe; Andermann, Artur M.; Seidel, Eliton Popovicz; Tenfen, Wagner; Sahoo, B. K.

doi:10.1016/j.elspec.2022.147186

Cited by 4 publications

(3 citation statements)

References 53 publications

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“…For Cd, there is great divergence among the MP cross sections [8] and the experimental data of Kontros et al [6]. Given our recent experience investigating shape resonances in positron-Zn/Cd scattering at low energies [15], we understand that further investigations on the possible existence of d-wave shape resonances would be welcome as well as a second theoretical calculation for Cd in order to contrast with the previous theoretical and experimental results.…”

Section: Introductionmentioning

confidence: 85%

“…In our previous investigations on positron-atom scattering [15,16,18], we adopted the model electronic density of Salvat et al [25]. As highlighted by Rabasović et al [26], the model densities given by Salvat et al [25] provide a poor representation of the atomic shell structure.…”

Section: Methods and Proceduresmentioning

confidence: 99%

“…Table 1 shows the values of the static dipole polarizabilities α d for each target and the respective cutoff radius r c that reproduces the position of the p-wave shape resonances at the energies (E (eV)) reported by Burrow et al [4]. The values for α d were taken from our recent investigation on low-energy positron scattering by Zn and Cd [15] where the influence of higher order polarizabilities in positron-Zn/Cd was explored. For the sake of completeness, the ionization potentials (I (eV)) [31] are also included.…”

Section: Methods and Proceduresmentioning

confidence: 99%

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Semiempirical Calculations on Low-Energy Electron Scattering by Zn and Cd Atoms

Arretche

Tenfen

Sahoo

2022

Atoms

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Since total cross section measurements for electron scattering by Zn and Cd performed in the 1970s, the existence of p-wave shape resonances below 1 eV are well established in the literature. It was suggested that a second d-wave shape resonance could exist in both systems at an energy slightly higher than the one recorded for the p-wave but still below the inelastic threshold. We report elastic scattering calculations for electron collisions with Zn and Cd atoms below 4 eV using a semiempirical approach, as well the scattering length for both targets. Our results show that, indeed, the d-wave shape resonance is found in Zn but absent in Cd. In fact, our cross sections and the few other ones available for this energy range are in discrepancy with the available experimental total cross sections for Cd.

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Section: Introductionmentioning

confidence: 85%

Section: Methods and Proceduresmentioning

confidence: 99%

Section: Methods and Proceduresmentioning

confidence: 99%

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Semiempirical Calculations on Low-Energy Electron Scattering by Zn and Cd Atoms

Arretche

Tenfen

Sahoo

2022

Atoms

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Scale transformations in model exchange potentials in low energy electron-atom scattering

Arretche,

Seidel,

Tenfen

2024

Journal of Electron Spectroscopy and Related Phenomena

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Constructing Electron-Atom Elastic Scattering Potentials Using Relativistic Coupled-Cluster Theory: A Few Case Studies

Sahoo

2022

Atoms

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In light of the immense interest in understanding the impact of an electron on atoms in the low-energy scattering phenomena observed in laboratories and astrophysical processes, we propose an approach to construct potentials using relativistic coupled-cluster (RCC) theory for the determination of electron-atom (e-A) elastic scattering cross-sections (eSCs). The net potential of an electron, scattered elastically by an atom, is conveniently expressed as the sum of the static (Vst) and exchange (Vex) potentials due to interactions of the scattered electron with the electrons of the atom and potentials due to polarization effects (Vpol) on the scattered electron by the atomic electrons. The Vst and Vex potentials for the e-A eSC problems can be constructed with a knowledge of the electron density function of the atom, while the Vpol potential can be obtained using the polarizabilities of the atom. In this paper, we present the electron densities and electric polarizabilties of Be, Mg, Ne and Ar atoms using two variants of the RCC method. Using these quantities, we construct potentials for e-A eSC problems. To obtain Vpol accurately, we evaluate the second- and third-order electric dipole and quadrupole polarizabilities using a linear response approach.

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Polarization effects, shape resonances and bound states in low energy positron elastic scattering by Zinc and Cadmium vapours

Cited by 4 publications

References 53 publications

Semiempirical Calculations on Low-Energy Electron Scattering by Zn and Cd Atoms

Semiempirical Calculations on Low-Energy Electron Scattering by Zn and Cd Atoms

Scale transformations in model exchange potentials in low energy electron-atom scattering

Constructing Electron-Atom Elastic Scattering Potentials Using Relativistic Coupled-Cluster Theory: A Few Case Studies

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