Scattering of charged particles in quantum plasmas: Zero energy resonances

Karmakar, Akashdip; Ghoshal, Arijit

doi:10.1063/1.5091674

Cited by 11 publications

(7 citation statements)

References 43 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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“…The study of the screened atomic systems or confined atomic systems has become a hot topic of current research due to its importance in different areas of physics and chemistry . Particularly, the structures of the screened‐atomic systems or the atomic systems interaction with screened Coulomb potentials provide useful information for the plasma diagnostics and for the plasma spectroscopy .…”

Section: Introductionmentioning

confidence: 99%

“…The study of the screened atomic systems or confined atomic systems has become a hot topic of current research due to its importance in different areas of physics and chemistry. [26][27][28][29][30][31][32][33][34][35][36][37][38][39] Particularly, the structures of the screened-atomic systems or the atomic systems interaction with screened Coulomb potentials provide useful information for the plasma diagnostics and for the plasma spectroscopy. [40][41][42][43][44][45][46][47] Plasma effects on atomic processes are in general taken care of by suitable choice of the screened Coulomb potentials.…”

Section: Introductionmentioning

confidence: 99%

Tune‐out and magic wavelengths for hydrogenlike and screened‐hydrogenlike atoms

Wang

Kar

2019

Int J of Quantum Chemistry

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The tune‐out and magic wavelengths (TMWs) for the hydrogenlike and screened‐hydrogenlike atoms (Z = 1‐8) are calculated using a variational method. The first three tune‐out wavelengths for each of the nS (n = 1, 2, 3) states and the first three magic wavelengths for each of the 1S‐nS (n = 2, 3) transitions of the hydrogenlike atoms in terms of nuclear charge Z, and the first TMWs for the above mentioned states or transitions of the screened‐hydrogenlike atoms in terms of the screening parameter μ and Z are presented. All the results for the TMWs are reported for the first time in the literature except the magic wavelengths for the hydrogen atom. The magic wavelengths for hydrogen atom are in agreement with the available data. The precise estimation of the TMWs would be helpful for the design of the ion‐trapping experiment of the hydrogenic systems. Our study is expected to be useful for the measurements of the hydrogenic 1S‐2S and 1S‐3S transitions spectroscopy for the improved accuracy.

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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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Scattering of charged particles in quantum plasmas: Zero energy resonances

Cited by 11 publications

References 43 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

Tune‐out and magic wavelengths for hydrogenlike and screened‐hydrogenlike atoms

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

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