Properties of the Positronium Negative Ion Embedded in Non-ideal Classical Plasmas

Das, Biswajit; Ghoshal, Arijit

doi:10.1007/s00601-020-01556-2

Cited by 17 publications

(7 citation statements)

References 71 publications

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“…The pseudopotential () includes the collective events and the screening effects in it, and properly describes particle interaction in CNP for 0 ≤ γ ≤ 4.0. Note that this potential takes the form of the Debye‐Huckel potential, when γ → 0, that is, in the weak limit of non‐ideality. The pseudopotential () has been used in a number of studies relating to CNP [32–35]. In this paper, we use the pseudopotential () to describe the interaction potential among the charged particles in He embedded in CNP.…”

Section: Theory and Calculationsmentioning

confidence: 99%

Stability of the helium atom embedded in classical nonideal plasmas

Das

Ghoshal

2021

Int J of Quantum Chemistry

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Properties of the ground state of the helium atom embedded in classical nonideal plasmas have been investigated within the framework of variational method. The background plasma is described by a pseudopotential which has been deduced from the sequential solution of Bogolyubov's hierarchy equations. An extensive trial wave function is employed in Rayleigh-Ritz variational principle to compute various quantities associated with the ground state of helium atom quite accurately. A detailed study is made on the changes in those quantities introduced by the varying nonideality of the plasma in a wide range. In particular, special emphasis is made to study the stability of the atom in the plasma by computing the critical values of screening parameter and nonideal parameter accurately. To the best of our knowledge, such a study on the stability of helium atom in classical nonideal plasmas is reported for the first time in the literature.

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Section: Theory and Calculationsmentioning

confidence: 99%

Stability of the helium atom embedded in classical nonideal plasmas

Das

Ghoshal

2021

Int J of Quantum Chemistry

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“…They also mention the range of temperatures, plasma densities and the non-ideality parameters within which the atom remains bound and hence is stable within NICP. Das and Ghoshal [6] also worked on the stability of the hydrogen molecular ion (H + 2 ), the stability of the negative hydrogen ion (H − ) [7], the properties and stability of the positronium negative ion [8] and the photodetachment cross section of the negative hydrogen ion (H − ) [9] in the presence of plasma non-ideality. Also, they [10] adopted the variational method to study the properties of the ground state of helium atoms and concluded that the 1 S state of He is stable in NICP for temperatures lying between (1-10) ×10 4 K and plasme density in the range 2.7 × (10 23 -10 26 ) m −3 .…”

Section: Introductionmentioning

confidence: 99%

Non-ideal classical plasma: laser pulse effects and dynamic dipole polarizabilities

Lumb Talwar,

Lumb,

Sen

et al. 2023

J. Phys. B: At. Mol. Opt. Phys.

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The properties of a hydrogen atom inside a non-ideal classical plasma, in terms of its behaviour in the presence of an applied laser pulse, are explored. The strength of the pulse is chosen such that it mantains near sphericity of the system. The pulse parameters have a strong bearing on the final state attained by the system after its interaction with the pulse. Dynamic dipole polarizability is calculated and the poles are observed to be red shifted with increase in non-ideality as well as increase in temperature of plasma. These polarizabilities for frequencies of the field below the frequency corresponding to the first pole are found to be greater for larger values of field frequencies, plasma non-ideality and electron plasma temperatures.

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“…It is to be mentioned that equation () reduces to the DHP () in the weak limit of

γ

(that is

γ \to 0

) and pure Coulomb potential for

μ \to 0

. Of late, a number of theoretical investigations relating to non‐ideal classical plasmas (NICP) used the pseudopotential () to represent the organized effect of the plasmas [33–50].…”

Section: Introductionmentioning

confidence: 99%

“…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].…”

mentioning

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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Properties of the Positronium Negative Ion Embedded in Non-ideal Classical Plasmas

Cited by 17 publications

References 71 publications

Stability of the helium atom embedded in classical nonideal plasmas

Stability of the helium atom embedded in classical nonideal plasmas

Non-ideal classical plasma: laser pulse effects and dynamic dipole polarizabilities

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

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