Positronium formation in positron-hydrogen collisions with Debye potentials

Ma, Jianbo; Cheng, Yongjun; Wang, Y. C.; Zhou, Yajun

doi:10.1063/1.4729663

Cited by 24 publications

(21 citation statements)

References 30 publications

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“…It is worthy to mention here that some calculations to study the collisonal and structural properties of positron-hydrogen system embedded in weakly coupled plasma have been reported in the recent years. These include elastic collision, 15 inelastic collision, 16,17 positronium formation, [19][20][21] resonances. 86,87 To the best of our knowledge, the results for the processes (ii) and (v) are new.…”

Section: Introductionmentioning

confidence: 99%

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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: Introductionmentioning

confidence: 99%

“…But in a plasma environment, such calculations are very limited. [15][16][17][19][20][21] In this work, we use coupled multi-channel two-body Lippmann-Schwinger equations, developed by Sloan and a) E-mail: aghoshal@math.buruniv.ac.in. Moore, 85 to investigate the effect of screening of weakly coupled plasmas on the following processes:…”

Section: Introductionmentioning

confidence: 99%

Positron scattering from hydrogen atom embedded in weakly coupled plasma

2013

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“…Atomic excitation and ionization processes play an essential role in the interpretation of various phenomena associated with astrophysics, hot plasma physics, and experiments performed with charged ions. Of particular importance is the collision phenomena involving positrons, [9][10][11][12][13][14][15][16][17][18][19][20][21][22][23] because positron collisions have several important applications in diverse fields of astrophysics [24][25][26][27][28][29][30][31] and plasma physics. [32][33][34] Recently, the authors have investigated the effects of screening of weakly coupled plasma on the formation of Rydberg atoms due to the positron impact excitations of hydrogen atom.…”

Section: Introductionmentioning

confidence: 99%

Positron impact excitations of hydrogen atom embedded in dense quantum plasmas: Formation of Rydberg atoms

Rej

Ghoshal

2014

Physics of Plasmas

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Formation of Rydberg atoms due to 1 s ! nlm excitations of hydrogen by positron impact, for arbitrary n, l, m, in dense quantum plasma has been investigated using a distorted wave theory which includes screened dipole polarization potential. The interactions among the charged particles in the plasma have been represented by exponential cosine-screened Coulomb potentials. Making use of a simple variationally determined hydrogen wave function, it has been possible to obtain the distorted wave scattering amplitude in a closed analytical form. A detailed study has been made to explore the structure of differential and total cross sections in the energy range 20-300 eV of incident positron. For the unscreened case, our results agree nicely with some of the most accurate results available in the literature. To the best of our knowledge, such a study on the differential and total cross sections for 1 s ! nlm inelastic positron-hydrogen collisions in dense quantum plasma is the first reported in the literature. V C 2014 AIP Publishing LLC.

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“…Resonances in electron-atom scattering with SCP have been investigated in recent years [37][38][39][40][41][42][43]. Studies of positron-hydrogen scattering in plasmas such as the positronium formation cross sections have been reported [44][45][46]. Investigations on resonances in positron hydrogen resonances with SCP are relatively scarce, but it has started to attract attention [47][48][49][50].…”

Section: Introductionmentioning

confidence: 99%

Natural and Unnatural Parity Resonance States in the Positron-Hydrogen System with Screened Coulomb Interactions

Zhou

2015

Atoms

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Abstract:In the present work, we report calculations of resonances in the positron-hydrogen system interacting with screened Coulomb potentials using the method of complex scaling together with employing correlated Hylleraas wave functions. Resonances with natural and unnatural parities are investigated. For the natural parity case, resonance parameters (energy and width) for D-wave resonance states with even parity lying below various positronium and hydrogen thresholds up to the H(N = 4) level are determined. For the unnatural parity case, results for P-even and D-odd resonance states with various screened Coulomb interaction strengths are located below different lower-lying Ps and H thresholds.

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Positronium formation in positron-hydrogen collisions with Debye potentials

Cited by 24 publications

References 30 publications

Positron scattering from hydrogen atom embedded in weakly coupled plasma

Positron scattering from hydrogen atom embedded in weakly coupled plasma

Positron impact excitations of hydrogen atom embedded in dense quantum plasmas: Formation of Rydberg atoms

Natural and Unnatural Parity Resonance States in the Positron-Hydrogen System with Screened Coulomb Interactions

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