Low-energy elastic scattering of positrons by 
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Arretche, Felipe; Mazon, K. T.; Michelin, S. E.; Lee, M.-T.; Lima, Margareth Guimarães

doi:10.1103/physreva.99.022703

Cited by 13 publications

(16 citation statements)

References 49 publications

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“…While TCS measurements based on the Beer-Lambert law are the basic test of any theory, it is the DCS that translates the fine tuning between different components of the scattering potential. For example, in positronmolecule scattering, it is the degree of polarization considered in the potential which affects the position of the minima at the intermediate angles in the elastic DCS while the scattering at high angles (backward scattering) is regulated by the repulsive short range static potential [32].…”

Section: Resultsmentioning

confidence: 99%

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: Resultsmentioning

confidence: 99%

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

Arretche

Tenfen

Sahoo

2022

Atoms

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“…the employment of an inadequate polarization interaction. We expect that an improved (an ab initio formulation or the completion of the interaction with higher order polarizabilities) correlation polarization model may enrich the description of the qualitative behaviour of the differential cross sections, when combined with a more complete expansion of the scattering wave function, such as the calculations for positron scattering with O 2 molecules [20].…”

Section: Resultsmentioning

confidence: 99%

“…Improvement in the partial wave expansion may be necessary, as we can notice from higher energies DCS's. Also, we intend to verify further improvements in the description of the elastic cross sections for positron collisions with C 2 H 2 by the inclusion of higher order polarizabilities in the scattering potential model, as proven very relevant for positron collisions with O 2 [20].…”

Section: Discussionmentioning

confidence: 99%

Low-energy positron scattering from C2H2

2020

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We present positron scattering cross sections with C2H2 molecules obtained with the Method of Continued Fractions in the static plus correlation polarization level. The differential and integral cross sections are compared with available theoretical and experimental approaches, and sensible improvement in the description of the qualitative behaviour of the differential cross sections is observed. These improvements are discussed through the evaluation of the average absolute differences between theoretical approaches and the respective normalized experimental data. Our elastic integral cross sections exhibit good agreement with model and ab initio approaches and with the available experimental data.

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“…For the

^{3} \sum_{g}^{-}

ground state wavefunction of molecular oxygen, we have applied the Gaussian basis set used in Tenfen et al [54] with uncontracted exponents adding a f‐type function (with exponent equal to 0.01). As shown in Table 1, the basis set employed in the O 2 calculations gives a ground state energy to the triplet state of −149.66 Hartree ( E h ) and electric quadrupole moment of −0.286

{ea}_{0}^{2}

, in good agreement with multireference averaged coupled pair functional data [55, 56] and experimental [57, 58] measurements.…”

Section: Theorymentioning

confidence: 99%

Young‐type interference in soft lepton scattering of diatomic homonuclear molecules

Barp

Arretche

2022

Int J of Quantum Chemistry

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Interference patterns in the scattering of positrons and electrons by diatomic homonuclear molecules are ab initio calculated. Our results are compared to model potential calculations with incident particles in twisted and plane wave states. All calculations are obtained in the first Born approximation framework. The comparison of the elastic differential cross sections shows how an ab initio description of the electronic molecular structure influence the interference minima structure. The origin of such patterns is also discussed.

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Low-energy elastic scattering of positrons by O2

Cited by 13 publications

References 49 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

Low-energy positron scattering from C2H2

Young‐type interference in soft lepton scattering of diatomic homonuclear molecules

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