Positron Scattering from Hydrogen Atom in Non-ideal Classical Plasmas

Das, Kamalika; Das, Biswajit; Ghoshal, Arijit

doi:10.1007/s00601-023-01801-4

Cited by 5 publications

(2 citation statements)

References 65 publications

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“…In recent years, a number of theoretical investigations have been carried out to explore the effects of NI of the classical plasmas on the structural and collisional behaviour of atomic systems. [5,[8][9][10][11][12][13][14][15][16][17][18][19][20][21][22] In the present work, we focus on the doubly excited singlet S ( 1 S e ) states in the helium atom (He) embedded in CNIP. Doubly excited states (DES) play a key role in the structural and collisional behaviours of an atomic system.…”

Section: Introductionmentioning

confidence: 99%

Helium atom embedded in non‐ideal classical plasmas: Doubly excited singlet S states

Das,

Ghoshal,

2024

Contrib. Plasma Phys

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The influence of the non‐ideality (NI) of the classical plasmas on the doubly excited singlet S states of the helium atom (He) embedded in the plasma has been investigated theoretically. A pseudopotential containing the Debye length and the non‐ideality parameter (NIP) as its characteristics is used to represent the screened interaction potentials in the plasma. Using a large wavefunction within the framework of the stabilization method, it has been possible to recognize six doubly excited singlet S states (five lying below the He+(2S) excitation threshold and one lying below the He+(3S) excitation threshold) for the plasma‐free case. The energies and the autoionization life‐times of those states are computed by fitting the density of states to the Lorentzian form. Convergence of the computed results is corroborated by increasing the number of terms in the employed wavefunction. For the plasma‐free case, these results are in excellent agreement with the established results in the literature. A comprehensive analysis has been made on changes induced on those doubly excited states by varying NI over a wide range. It has been observed that the energies of the states gradually approach the corresponding threshold energies with the increasing NI of the plasma, whereas the change in the life‐times (alternatively the widths of the states) of the states shows distinctive features depending on the angular momentum of an individual electron.

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Section: Introductionmentioning

confidence: 99%

Helium atom embedded in non‐ideal classical plasmas: Doubly excited singlet S states

Das,

Ghoshal,

2024

Contrib. Plasma Phys

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“…0. Of late, a number of theoretical investigations relating to non-ideal classical plasmas (NICP) used the pseudopotential (3) to represent the organized effect of the plasmas [33][34][35][36][37][38][39][40][41][42][43][44][45][46][47][48][49][50].…”

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confidence: 99%

Spherically confined hydrogenic atoms under classical non‐ideal plasmas: Scaling law for the critical cage size

Das,

Ghoshal

2023

Int J of Quantum Chemistry

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An elegant calculation is carried out to investigate the effects of the non‐ideality of classical plasma on the energy levels of the hydrogenic atoms held in a spherical cage. Organized effect of the non‐ideal classical plasma is described by an analytical pseudopotential which contains the Debye length and non‐ideality parameter as parameters. Convergent results for the bound states are obtained variationally by utilizing a large trail function containing cosine term which automatically takes care of the requisite boundary conditions. For the plasma‐free case, our results are in excellent agreement with the most accurate results available in the literature. An inclusive study is made to explore the changes emerging in the energy levels due to the variation of the plasma parameters and cage size. Special emphasis is made on the determination of critical cage size precisely. The present study specifically reveals that the increasing plasma non‐ideality leads to the elongation of the critical cage size. Moreover, it is empirically found that the critical cage size for a given hydrogenic atom can be obtained from a scaling law.

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Dynamics of electron capture in positron‐hydrogen scattering under dense semi‐classical plasmas

Das,

Ghoshal

2024

Contrib. Plasma Phys

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The scattering dynamics of electron capture in ‐H(1 s) scattering under dense semi‐classical plasma (DSCP) environments has been investigated theoretically. Coupled multi‐channel two‐body Lippmann‐Schwinger equations have been solved by retaining +H(1 s) and p + Ps(1 s) channels to calculate the cross sections (CS) of the electron capture process at intermediate and high incident energies. The effective interaction of the plasma charged particles is modelled by a pseudopotential which is a function of two parameters, namely the plasma screening strength and the de Broglie wavelength. A detailed study is made to explore the changes in the CSs of the above‐mentioned process with respect to the variation in the plasma screening strength and de Broglie wavelength. Significant changes are found to take place, when the screening strength and the de Broglie wavelength are varied. Specifically, the sharp minimum in the differential CS moves toward the forward direction with increasing de Broglie wavelength at a given screening strength.

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Positron Scattering from Hydrogen Atom in Non-ideal Classical Plasmas

Cited by 5 publications

References 65 publications

Helium atom embedded in non‐ideal classical plasmas: Doubly excited singlet S states

Helium atom embedded in non‐ideal classical plasmas: Doubly excited singlet S states

Spherically confined hydrogenic atoms under classical non‐ideal plasmas: Scaling law for the critical cage size

Dynamics of electron capture in positron‐hydrogen scattering under dense semi‐classical plasmas

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