Journal ArticleDOI
Positronium formation in positron-helium collisions with a screened Coulomb interaction
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TLDR
In this article, the Coulomb screening was applied to positronium formation in positron-helium collisions under the effect of a Coulomb screen, e+ + He(1s 2) → Ps(100) + He+(100), using the second-order distorted-wave approximation (DWA) and taking into consideration the screened dipole polarisation potential at low and intermediate incident positron energies in the range, 6 − 500 eV.Abstract:
A study is conducted on positronium (Ps) formation in positron-helium collisions under the effect of a Coulomb screening, e+ + He(1s
2) → Ps(100) + He+(100), using the second-order distorted-wave approximation (DWA) and taking into consideration the screened dipole polarisation potential at low and intermediate incident positron energies in the range, 6 − 500 eV. The theoretical model for the scattering calculation is fairly accurate and predicts a number of interesting features in the total and differential cross sections for the screening parameter, μ = 0.0−0.4. The existence of resonances in the S-, P-, D- and F-partial waves has been reported in this work. Surface plots of the total and differential cross sections have also been presented to illustrate the interesting nature of the Ps formation in this scattering process.read more
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Spectral/structural data of helium atoms with exponential-cosine-screened coulomb potentials
Y.-C. Lin,C. Y. Lin,Yew Kam Ho +2 more
TL;DR: In this article, a computing scheme to deal with the electron-electron correlation terms with the screened Coulomb interactions instead of the conventional expansion method using the Gegenbauer's addition theorem was developed.
Journal ArticleDOI
Positron scattering from hydrogen atom embedded in dense quantum plasma
TL;DR: In this article, the authors investigated the scattering of positrons from the ground state of hydrogen atoms embedded in dense quantum plasma by applying a formulation of the three-body collision problem in the form of coupled multi-channel two-body Lippmann-Schwinger equations.
Journal ArticleDOI
ERRATUM: Positron-impact ionization and positronium formation from helium
TL;DR: In this paper, the total ionization cross-section by positron impact on He from threshold up to 850 eV is reported and compared with the existing experimental and theoretical data.
An investigation of resonances in e + -H scattering embedded in Debye plasmas
Ye Ning,Z. C. Yan,Y. K. Ho +2 more
Journal ArticleDOI
An investigation of resonances in e+-H scattering embedded in Debye plasma
Ye Ning,Zong-Chao Yan,Yew Kam Ho +2 more
TL;DR: In this article, the S-wave and P-wave resonances in weakly coupled Debye plasma in which the interaction between two charged particles is represented by a screened Coulomb potential were analyzed.
References
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Atomic physics in hot plasmas
TL;DR: In this paper, the ionic potential and charge and excited state distributions in hot plasmas were modeled and the emission spectrum and its components were used for plasma diagnostics and radiation absorbing processes and radiation transport.
Journal ArticleDOI
Calculation of the density of resonance states using the stabilization method.
TL;DR: The stabilization method is used to calculate the density of resonance states and when applied to isolated resonances yields a most simple method for extracting the resonance energy and width.
Journal ArticleDOI
Mechanisms for charge transfer (or for the capture of any light particle) at asymptotically high impact velocities
Robin Shakeshaft,Larry Spruch +1 more
TL;DR: In this article, the authors discuss three different mechanisms for the capture of a light particle from a bare heavy nucleus by another bare heavy nuclei which is incident with a very high relative velocity, and a comparison of the relative importance of the different mechanisms in the case of electron capture from hydrogenlike ''atoms''.
Journal ArticleDOI
Measurements of total scattering cross sections for intermediate-energy positrons and electrons colliding with helium, neon, and argon
TL;DR: In this article, total scattering cross sections have been measured in the same apparatus for positrons and electrons colliding with helium, neon, and argon atoms in the energy range from 15 to 800 eV using a beam-transmission technique.