Vibrational cross sections for positron scattering by nitrogen molecules

Mazon, K. T.; Tenfen, Wagner; Michelin, S. E.; Arretche, Felipe; Lee, M.-T.; Fujimoto, M. M.

doi:10.1103/physreva.82.032704

Cited by 15 publications

(6 citation statements)

References 32 publications

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“…The calculated cross sections from Mukherjee and Gianturco [74] and from Mukherjee and Mukherjee [75] are too low when compared to recent experiments. The results from Gianturco and Mukherjee [74] are very close to those by Mazon et al [76]. Slighly higher are the results from Mukherjee and Mukherjee [75].…”

Section: Resultssupporting

confidence: 84%

“…Therefore rotational and vibrational effects are neglected and no Ps-formation is included. The same is true for the calculated cross sections by Mazon et al [76] and by Tenfen et al [77]. The experimental data sets are showing total cross sections, which includes rotational, vibrational and Ps-formation channels.…”

Section: Resultssupporting

confidence: 57%

“…The shown experimental data does not contain any corrections for the angular discrimination error. Figure 5 also shows a selection of calculations from other groups: Gianturco and Mukherjee [74], Mukherjee and Mukherjee [75] Mazon et al [76], and Tenfen et al [77]. Our calculations are giving elastic cross sections using the fixed nuclei approximation in the body fixed reference frame.…”

Section: Resultsmentioning

confidence: 99%

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Positron-electron correlation-polarization potentials for the calculation of positron collisions with atoms and molecules*

Franz

2017

Eur. Phys. J. D

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Abstract. We present correlation-polarization potentials for the calculation of scattering cross sections of positrons with atoms and molecules. The potentials are constructed from a short-range correlation term and a long-range polarization term. For the short-range correlation term we present four different potentials that are derived from multi-component density functionals. For the long-range polarization term we employ a multi-term expansion. Quantum scattering calculations are presented for low energy collisions of positrons with two atomic targets (argon and krypton) and two molecular targets (nitrogen and methane). For collision energies below the threshold for Positronium formation our calculations of scattering cross sections are in good agreement with recent data sets from experiments and theory.

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Section: Resultssupporting

confidence: 84%

Section: Resultssupporting

confidence: 57%

Section: Resultsmentioning

confidence: 99%

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Positron-electron correlation-polarization potentials for the calculation of positron collisions with atoms and molecules*

Franz

2017

Eur. Phys. J. D

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“…Finally, as a future perspective, we shall study the effect of hyperpolarizabilities in the vibrational and rotational cross sections as recently done for N 2 ,, and O 2 . , Additionally, we can evaluate the effects of these quantities in the study of elastic cross sections in electron-F 2 collisions and possibly also the vibrational excitation cross sections following Martendal and Mazon, considering the dependence of hyperpolarizabilities with the internuclear distance …”

Section: Discussionmentioning

confidence: 99%

Low Energy Positron Scattering by F and F₂

2022

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We have determined integral and differential elastic cross sections for positron scattering with atomic F and F2 molecules from 0.01 to 1000 eV with different theoretical approaches. Higher order polarizabilities were successively considered in the scattering potential, and we observed that the differential and integral cross sections converge only when the pure dipole second hyperpolarization level is taken into account, demonstrating the importance of the hyperpolarization effects on the low energy positron scattering dynamics. Ramsauer structures were found for both targets, and in the particular case of the F atom, the effect of its quadrupole moment proved to be relevant around the position of the Ramsauer minimum, which was determined together with the scattering length for each of the adopted polarization schemes. A relation of these quantities with the matching radius between the correlation and polarization interactions is also discussed. Agreement between the model potential and ab initio cross sections for the lowest level of target polarization is found for F2. Since there is no previous theoretical or experimental determination of cross sections for these targets, we compared the differential cross sections of F2 with experimental data available for N2 and O2 and found reasonable agreement.

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“…On the other hand, the theoretical description of positron elastic collisions was found to be much more challenging, particularly for ab initio procedures, despite the fact that no exchange interaction is present (for example see Ref. [6] and references therein). For positrons the repulsive static potential is counterbalanced solely by an attractive polarization potential making computational approaches very sensitive to the short-range positron -target's electrons (nonadiabatic) correlations.…”

Section: Introductionmentioning

confidence: 99%

A rigid sphere approach to positron elastic scattering by noble gases, molecular hydrogen, nitrogen and methane

Fedus

2016

Eur. Phys. J. D

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Abstract.A simple potential model of a rigid sphere combined with an adiabatic dipole polarization (∼r −4 ) is tested for positron-atom and positron-molecule elastic collisions. The numerical model, which is based on the analytical solution of radial Schrödinger equation for r −4 potential, depends solely upon the average dipole polarizability of the target and one adjustable parameter -the radius of a hard core. The validity of model is assessed by an extensive comparative study against numerous experimental cross-sections and theoretical phase-shifts of angular momentum partial waves for positrons scattered elastically by He, Ne, Ar, Kr, Xe, H2, N2 and CH4. In particular it is shown that this very simple approach can be used to model positron elastic collisions with targets characterized by moderate dipole polarizabilities (Ar, Kr, H2, N2) in good agreement with experiments for impact energies covering almost entire range from the positronium formation threshold down to the zero energy.

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Vibrational cross sections for positron scattering by nitrogen molecules

Cited by 15 publications

References 32 publications

Positron-electron correlation-polarization potentials for the calculation of positron collisions with atoms and molecules*

Positron-electron correlation-polarization potentials for the calculation of positron collisions with atoms and molecules*

Low Energy Positron Scattering by F and F₂

A rigid sphere approach to positron elastic scattering by noble gases, molecular hydrogen, nitrogen and methane

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Vibrational cross sections for positron scattering by nitrogen molecules

Cited by 15 publications

References 32 publications

Positron-electron correlation-polarization potentials for the calculation of positron collisions with atoms and molecules*

Positron-electron correlation-polarization potentials for the calculation of positron collisions with atoms and molecules*

Low Energy Positron Scattering by F and F2

A rigid sphere approach to positron elastic scattering by noble gases, molecular hydrogen, nitrogen and methane

Contact Info

Product

Resources

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Low Energy Positron Scattering by F and F₂