Stability of the helium atom embedded in classical nonideal plasmas

Das, Biswajit; Ghoshal, Arijit

doi:10.1002/qua.26649

Cited by 14 publications

(8 citation statements)

References 48 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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“…In this context, high‐density quantum plasmas and nonideal classical plasmas with low temperature and high‐density are important. [ 61 ] Furthermore, the obvious and sensitive effects of the endohedral cage on photoionization are interesting as well as the interaction with different confinement effects. Within this motivation,

{\text{H@C}}_{n}

implanted in the NCP is taken into consideration, which is a first in the relevant literature to the best of our knowledge.…”

Section: Introductionmentioning

confidence: 99%

Photoionization Cross Section for H@Cn${\text{H@C}}_{n}$ Implanted in Nonideal Classical Plasmas

Bahar

Martínez‐Flores

2023

Annalen der Physik

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In this study, photoionization cross sections of guest hydrogen atom in endohedral fullerene () modeled by the Woods–Saxon confinement potential implanted in the nonideal classical plasma (NICP) under spherical confinement are reported for the first time in the related literature. The relevant wave equation is solved numerically via the tridiagonal matrix method and then the energy levels, bound and continuum wave functions are interpreted. Plasma effect is examined by considering plasma temperature and density and is evaluated in the photoionization process. Since the plasma modifies the discrete and continuum spectra by changing the potential energy of hydrogen atom, it closely affects the overlapping of the wave functions of ground state and continuum state. This effect has a distinct response on photoionization resonances. Using different values of endohedral confinement parameters, which means regarding different types of fullerenes, detailed analysis of energy levels, bound and continuum wave functions, and photoionization cross sections are provided by evaluating confinement width, depth, smoothing effect and distance from the spherical encompassement center. The photoionization process of implanted in the NICP (nonideal classical plasma) is highly sensitive to both plasma and endohedral confinement. At this sensitivity, Cooper resonance character is like an encoder for fullerene structure.

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“…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 . Das et al [11] executed a detailed study of single, double, and total photoionization of helium atoms for such a case taking into account high photon energies and employing a dipole approximation in the nonrelativistic regime.…”

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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Stability of the helium atom embedded in classical nonideal plasmas

Cited by 14 publications

References 48 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

Photoionization Cross Section for H@Cn${\text{H@C}}_{n}$ Implanted in Nonideal Classical Plasmas

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

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