e++ H(ns) → Ps(n′s) + p for arbitrarynandn′

Ghoshal, Arijit; Mandal, P.

doi:10.1088/0953-4075/41/17/175203

Cited by 11 publications

(14 citation statements)

References 8 publications

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“…Only to calculate the partial-wave amplitudes T l B ð31Þ; T l B ð33Þ use has been made of Lewis integral. 21,81 We use the expression for scattering amplitude Y ba to compute the differential cross section as a function of scattering angle and energy. We have approximated the higher partial wave contributions to the present amplitudes by the TABLE III.…”

Section: Theorymentioning

confidence: 99%

Positron scattering from hydrogen atom embedded in weakly coupled plasma

2013

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The positron-hydrogen collision problem in weakly coupled plasma environment has been investigated by applying a formulation of the three-body collision problem in the form of coupled multi-channel two-body Lippmann-Schwinger equations. The interactions among the charged particles in the plasma have been represented by Debye-Huckel potentials. A simple variational hydrogenic wave function has been employed to calculate the partial-wave scattering amplitude. Plasma screening effects on various possible mode of fragmentation of the system e þ þ Hð1sÞ during the collision, such as 1s ! 1s and 2s ! 2s elastic collisions, 1s ! 2s excitation, positronium formation, elastic proton-positronium collisions, have been reported. Furthermore, a detailed study has been made on differential and total cross sections of the above processes in the energy range 13.6-350 eV of the incident positron. V C 2013 American Institute of Physics.

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Section: Theorymentioning

confidence: 99%

Positron scattering from hydrogen atom embedded in weakly coupled plasma

2013

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“…θ is the angle between axes Z and Z . In the be readily calculated by employing the bound-free transition form factors of Belkic [36]: (25) where the factor A (v f ) αβ is given by Eq. (21) in Ref.…”

Section: B Ps Formation Into Arbitrary Statesmentioning

confidence: 99%

“…Moreover, few calculations have been performed for higher excited-state Ps formations. Recently, Ghoshal et al [25] have successfully applied the DWA method to study the transition of arbitrary hydrogen s state to arbitrary Ps s state. A general formalism to obtain Ps formation cross sections for all reactions has been derived in the intermediate and high energy range.…”

Section: Introductionmentioning

confidence: 99%

Positronium formation for positron scattering from hydrogen: Maximum positions and scaling law

2011

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Ground-and excited-state positronium (Ps) formation from the hydrogen atom by positron impact at low and intermediate energies have been studied within the framework of two-center two-channel eikonal final state-continuum initial distorted wave model. A general method for obtaining Ps formation into arbitrary final states has been derived. The present results of Ps (1s), Ps (n = 2), and total Ps formation cross sections agree very well with previous close-coupling calculations and experimental measurements. The maximum positions of Ps(n) formation cross sections are found to be in good agreement with the prediction of wave vector matching model introduced by Charlton [J. Phys. B 39, 4575 (2006)]. We also present a scaling law for Ps (n) formation cross sections that is valid for all n in the entire energy range.

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“…Only the calculations of the partial-wave amplitudes T l B ð31Þ; T l B ð33Þ require to invoke the Lewis integral. 34 Using the expression for scattering amplitude Y ba, we calculate the differential cross section as a function of scattering angle and energy for positron-hydrogen collisions as…”

Section: Theorymentioning

confidence: 99%

Positron scattering from hydrogen atom embedded in dense quantum plasma

et al. 2013

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Scattering of positrons from the ground state of hydrogen atoms embedded in dense quantum plasma has been investigated by applying a formulation of the three-body collision problem in the form of coupled multi-channel two-body Lippmann-Schwinger equations. The interactions among the charged particles in dense quantum plasma have been represented by exponential cosine-screened Coulomb potentials. Variationally determined hydrogenic wave function has been employed to calculate the partial-wave scattering amplitude. Plasma screening effects on various possible mode of fragmentation of the system e þ þ Hð1sÞ during the collision, such as 1s ! 1s and 2s ! 2s elastic collisions, 1s ! 2s excitation, positronium formation, elastic proton-positronium collisions, have been reported in the energy range 13.6-350 eV. Furthermore, a comparison has been made on the plasma screening effect of a dense quantum plasma with that of a weakly coupled plasma for which the plasma screening effect has been represented by the Debye model. Our results for the unscreened case are in fair agreement with some of the most accurate results available in the literature. V C 2013 AIP Publishing LLC. [http://dx.

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e⁺+ H(ns) → Ps(n′s) + p for arbitrarynandn′

Cited by 11 publications

References 8 publications

Positron scattering from hydrogen atom embedded in weakly coupled plasma

Positron scattering from hydrogen atom embedded in weakly coupled plasma

Positronium formation for positron scattering from hydrogen: Maximum positions and scaling law

Positron scattering from hydrogen atom embedded in dense quantum plasma

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