A local optical potential study of elastic electron-atom scattering

Vanderpoorten, R

doi:10.1088/0022-3700/8/6/019

Cited by 95 publications

(12 citation statements)

References 27 publications

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“…However, plasma effects like screening cannot be included by using the experimental transport cross sections for isolated systems. An alternative to the polarization potential is the construction of a so-called optical potential [21][22][23][24]. Such a potential model has been successfully applied to describing the e-a momentum-transfer cross sections of all noble gases in a wide energy region, see [25].…”

Section: Introductionmentioning

confidence: 99%

Contribution of electron-atom collisions to the plasma conductivity of noble gases

2017

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We present an approach which allows the consistent treatment of bound states in the context of the dc conductivity in dense partially ionized noble gas plasmas. Besides electron-ion and electronelectron collisions, further collision mechanisms owing to neutral constituents are taken into account. Especially at low temperatures T ≈ 1eV, electron-atom collisions give a substantial contribution to the relevant correlation functions. We suggest an optical potential for the description of the electronatom scattering which is applicable for all noble gases. The electron-atom momentum-transfer cross section is in agreement with experimental scattering data. In addition the influence of the medium is analysed, the optical potential is advanced including screening effects. The position of the Ramsauer minimum is influenced by the plasma. Alternative approaches for the electron-atom potential are discussed. Calculations of the electrical conductivity are compared with experimental data.

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Section: Introductionmentioning

confidence: 99%

Contribution of electron-atom collisions to the plasma conductivity of noble gases

2017

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“…However, at high energies its local form [10][11][12][13] can be used at the Hartree-Fock level. Now our full optical potential is…”

Section: Theorymentioning

confidence: 99%

Complex model optical potential for electron scattering from oxygen

Agrawal

Baluja

1996

Z Phys D - Atoms, Molecules and Clusters

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We report calculations of the total (elastic plus inelastic) cross-sections for the e-O system over a wide energy range 10-5000 eV. A local complex optical potential is calculated for the system using the atomic wavefunctions at the Hartree-Fock level. The real part of potential is composed of the attractive static, correlation polarisation and exchange potential. The imaginary component of the complex potential is a function of target charge density, incident electron energy and mean excitation energy. The resulting complex potential is treated in variable phase approach to yield complex phase shifts and total cross-sections. The total and elastic cross-sections are compared with the other available results. The agreement is excellent for total cross-sections with other theoretical work at energies greater than 100 eV. We have excellent agreement for elastic cross-sections with the experimental and theoretical results at all the energies. The elastic differential cross-sections are presented at 50 eV and 1000 eV. We fit the absorption cross-section values to Bethe asymptotic formula in high energy range (5500 eV). Ionisation cross-sections above 1000 eV are also deduced from the theory.

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“…20 In brief, in order to accurately calculate the elastic scattering cross section of electrons in liquid water, three main approaches have been proposed: the Born collision model, 21 the non-relativistic (Schrödinger) partial wave model, and the relativistic (Dirac) partial wave analysis. 22 The Dirac partial wave method is currently the most advanced to calculate such cross sections. Unfortunately, the validation of many of these calculations is difficult due to the scarcity of reliable experimental data in the liquid-phase of water.…”

Section: Introductionmentioning

confidence: 99%

Development of a new Geant4-DNA electron elastic scattering model for liquid-phase water using the ELSEPA code

Shin

Bordage

Emfietzoglou

et al. 2018

Journal of Applied Physics

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This paper presents the calculation of new elastic scattering cross sections for the simulation of electron interactions in liquid water. The calculations are based on the "ELastic Scattering of Electrons and Positrons by neutral Atoms" code, which adopts a Dirac partial wave analysis. A Muffin-tin potential was used in order to account for the liquid-phase of water, and the optical parameters of the correlationpolarization and the inelastic absorption potentials were optimized against vapour-phase water data. The differential and total elastic scattering cross sections calculated in the present work show a global agreement with the experimental data. The impact of these elastic scattering cross sections on the transport of electrons in liquid water was evaluated by track-structure simulations of range, dose-pointkernel, microdosimetric spectra, and ionization clustering using the Geant4-DNA simulation toolkit. The results are compared against those obtained with the elastic scattering models already available in Geant4-DNA and are discussed.

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A local optical potential study of elastic electron-atom scattering

Cited by 95 publications

References 27 publications

Contribution of electron-atom collisions to the plasma conductivity of noble gases

Contribution of electron-atom collisions to the plasma conductivity of noble gases

Complex model optical potential for electron scattering from oxygen

Development of a new Geant4-DNA electron elastic scattering model for liquid-phase water using the ELSEPA code

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