Classical Nonideal Plasmas Research Articles

Photoionization treatment of encompassed plasma-implanted exotic atoms

This work chews over exotic systems embedded in a non-ideal classical plasma (NICP) under impenetrable spherical confinement, including μH\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$\\mu \\hbox {H}$$\\end{document}, (μHe)+\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$(\\mu \\hbox {He})^{+}$$\\end{document}, and (μLi)++\\documentclass[12pt]{minimal} \\usepackage{amsmath} \\usepackage{wasysym} \\usepackage{amsfonts} \\usepackage{amssymb} \\usepackage{amsbsy} \\usepackage{mathrsfs} \\usepackage{upgreek} \\setlength{\\oddsidemargin}{-69pt} \\begin{document}$$(\\mu \\hbox {Li})^{++}$$\\end{document} systems within a nonrelativistic formalism. The photoionization processes of exotic atomic systems are thoroughly analyzed for different values of the NICP’s plasma screening parameter, hence plasma temperature and density, and the radius of spherical confinement. In each case, the energy levels of exotic systems are shown and interpreted in terms of their characteristics. The heavy nature of the muon significantly influences the entire process. Additionally, observable outcomes of different attraction effects originating from the nucleus in muonic systems on both the spectrum and photoionization are identified. The short lifetimes of relevant exotic systems due to the muon and the high bound state energies resulting from the strong attraction energy of the muon significantly inconvenience the photoionization process. However, these disadvantages can be overcome thanks to NICP and spherical confinement, thereby facilitating experimental applications. Important findings regarding these facilitation processes are presented in the present work.Graphical abstract

Positronium Negative Ion Embedded in Non-ideal Classical Plasmas: Doubly Excited Singlet S States

Positronium Negative Ion Embedded in Non-ideal Classical Plasmas: Doubly Excited Singlet S States

Polarizabilities of the negative ions of hydrogen and positronium in nonideal classical plasmas

We investigate the polarizability of the negative ions of hydrogen and positronium embedded in nonideal classical plasmas using correlated exponential wavefunctions. The interactions among the charged particles in plasmas have been taken care of by a pseudopotential, derived from a solution of Bogolyubov's hierarchy equations. The effects of nonideality of plasma on the ground state energies and the static and dynamic dipole polarizabilities of the negative ions have been studied in detail for wide range of nonideality. The results show interesting features.

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

The properties of a hydrogen atom inside a non-ideal classical plasma, in terms of its behavior in the presence of an applied laser pulse, are explored. The strength of the pulse is chosen such that it maintains 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 an increase in non-ideality as well as an increase in plasma temperature. The polarizabilities for frequencies of the field below the frequency corresponding to the first pole are found to be greater for larger values of field frequency, plasma non-ideality and electron plasma temperature.

Investigation of the Photoionization Process of Highly Charged Ions Under Non-ideal Classical Plasma Conditions

Investigation of the Photoionization Process of Highly Charged Ions Under Non-ideal Classical Plasma Conditions

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

AbstractIn 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.

Study of atomic spectroscopy and electron collision process in non-ideal classical plasmas

This manuscript presents an approach to the calculation of atomic properties and the electron collision excitation process in a non-ideal classical plasma, based on the relativistic distorted wave methodology. The method incorporating the pseudopotential obtained from a sequential solution of the Bogolyubov chain equations, that yields modification term to the calculation of the central field potential, is employed to characterize the interactions among the charged particles in plasmas. The bound/continuous state wave functions and the electron collision excitation matrix elements are determined using the aforementioned pseudopotential within a relativistic Dirac–Coulomb atomic structure framework. Systematic investigations on the effects of non-ideality of plasma on the electronic structures, radiative properties, and excitation cross sections within a selected temperature and density range are carried out in the specific cases of H atom and Ca18+ ion as they make it possible to reproduce the reference data well and thus to conclude with the reliability of the (present) method developed. Apart from its fundamental importance, this study is essential for several applications, especially for the analysis of atomic processes in non-ideal plasmas, and offers a new perspective for the calculation of atomic properties under different conditions in various astrophysical and laboratory plasmas.

Positron Scattering from Hydrogen Atom in Non-ideal Classical Plasmas

Positron Scattering from Hydrogen Atom in Non-ideal Classical Plasmas

Stability of hydrogen molecular ion in non-ideal classical plasmas

The effects of non-ideality (NI) of plasma on the energy levels of the hydrogen molecular ion () have been investigated by computing accurate binding energies of the ion under non-ideal plasma. The screened interaction potential in the plasma has been described by a pseudopotential which is derived from a solution of Bogolyubov’s hierarchy equations by ignoring the effects of quantum degeneracy. Changes in the energy of the ground state and the first excited state along with the expectations of some important quantities associated with the ground state of due to the NI of the plasma varying within a wide range have been studied in details. Special emphasis is made on the stability of the ion under varying NI of plasma. Moreover, appearance of the Borromean window and its changes with varying NI are also been discussed in details.

Photoionization of helium atom embedded in classical non-ideal plasma at high non-relativistic photon energies

The effects of the non-ideality (NI) of classical plasmas on the photoionization of helium atoms at high non-relativistic photon energies are investigated within the framework of the dipole approximation. Screened interaction in non-ideal plasmas is represented by an effective potential, deduced from a solution of Bogolyubov's hierarchy equations on discarding the effects of quantum degeneracy. A highly correlated wave function consisting of 715 terms for the ground state of helium has been used to evaluate the dipole matrix element. Changes in the asymptotic cross sections of single, double, and total photoionizations due to varying NI of plasmas have been investigated in detail. Particular emphasis is made to study the changes in the asymptotic ratio of the double-to-single photoionization cross section caused by the variation of non-ideality parameter in a wide range. It is found that increasing plasma NI makes the feasibility of occurrence of double photoionization to broaden.

Ground and doubly excited states of He atom in non-ideal classical plasmas: structural, entanglement and information theoretical measures

Ground and doubly excited states of He atom in non-ideal classical plasmas: structural, entanglement and information theoretical measures

Multipole polarizabilities and dipole oscillator strengths of H-atom in nonideal classical plasmas

Multipole polarizabilities and dipole oscillator strengths of H-atom in nonideal classical plasmas

Photodetachment of H− in non-ideal classical plasmas

The effects of non-ideality of classical plasmas on the cross sections of the photodetachment of the negative ion of hydrogen (H−) have been investigated within the framework of the dipole approximation. An effective potential, deduced from a solution of Bogolyubov's hierarchy equations, has been used to model the interactions among the charged particles in the non-ideal classical plasmas. Wave functions and energies of H−(1S) and H(1s) are calculated accurately by employing extensive basis sets within the framework of Ritz's variational principle. A detailed study is made on the changes of photodetachment cross section due to the varying non-ideality of plasma in a wide range. It is found that the wavelength corresponding to the maximum value of the photodetachment cross section moves forward due to the increasing non-ideality of plasma.

Variational Method for Hydrogen Atom Embedded in Non-ideal Classical Plasmas

The energies, radial moments, and radial distributions of different bound states [ $$n=1-6$$ , $$l=0-5$$ ; n and l being the principal and orbital angular momentum quantum numbers, respectively] of hydrogen atom embedded in non-ideal plasma background have been estimated under the framework of variational method. In order to study the effect of non-ideality, the same structural properties are also determined under the ideal classical plasma environment.

Stability of the helium atom embedded in classical nonideal plasmas

AbstractProperties 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.

Scattering of slow electron from hydrogen atom in non-ideal classical plasmas: Zero-energy resonances

The scattering of slow electrons from the hydrogen atom embedded in non-ideal classical plasma has been investigated by using the effective range theory. A pseudopotential, which has been derived from a solution of Bogolyubov's hierarchy equations, is used to represent the interactions among the charged particles in plasma. A detailed study is made on the effects of non-ideality of plasma on the scattering dynamics for a wide range of the non-ideality parameter. In particular, the zero-energy resonance phenomenon has been studied in detail by evaluating the singlet scattering length. It is found that the scattering length suffers significant changes when the non-ideality parameter approaches its critical value.

Electron transfer in proton‐hydrogen collisions in nonideal classical plasmas

AbstractEffects of nonideality of classical plasma on the reaction: p + H(1s) → H(nlm) + p has been investigated by carrying out fully quantum mechanical calculations within the framework of a first‐order distorted wave method. Scattering amplitude is calculated conveniently by employing a simple, variationally determined wave function of hydrogen atom embedded in nonideal classical plasma. A detailed study is made on the changes in electron transfer cross sections due to the nonideality of plasma varying from 0 to 4 and the incident proton energy lying between 10 and 500 keV. It has been found that nonideality of plasma causes substantial change in capture cross section.

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

Properties of the positronium negative ion embedded in non-ideal classical plasmas have been studied theoretically. A pseudopotential, derived from a solution of Bogolyubov’s hierarchy equations, is used to describe the interaction potentials of the charged particles in the ion. A large basis set is employed in Rayleigh–Ritz variational method to compute accurately various quantities, such as binding energy, cusp values, annihilation rate, associated with the ground state of the ion. A detailed study is made on the effects of non-ideality of plasma on those quantities. In particular, special emphasis is given to determine the ranges of plasma screening parameters within which the ion remains stable.

Stability of the negative ion of hydrogen in nonideal classical plasmas.

The stability of the negative ion of hydrogen (H^{-}) embedded in nonideal classical plasma has been studied by computing the ground state energy of the ion quite accurately. The interactions among the charged particles in plasma have been modelled by a pseudopotential, derived from a solution of Bogolyubov's hierarchy equations. An extensive basis set is employed in Rayleigh-Ritz variational method to compute the ground state energy of H^{-} for various values of plasma parameters. Effects of nonideality of plasma on the stability of the ion have been investigated in detail for a wide range of nonideality. Particular emphasis is made to compute accurately the critical values of the plasma screening parameters.

Scattering in non-ideal classical plasmas: Scattering length and zero-energy resonances

A fully quantum mechanical calculation has been performed to investigate the scattering of charged particles in nonideal classical plasmas (NICPs). Interactions among the charged particles in NICP have been depicted by a pseudopotential, derived from a sequential solution of Bogolyubov's chain equations. The Schwinger variational method (SVM) has been employed in the momentum space to compute the scattering phase shifts accurately for various plasma parameters. A detailed study has been made on the dynamics of electron-electron (e-e) and electron-proton (e-p) scattering in NICP for a wide range of plasma parameters. Special attention is paid to explore the scattering dynamics at low incident energies. In particular, scattering length and zero-energy resonances have been investigated in detail. Furthermore, effects of nonideality of plasma on the total cross section and transport cross section have also been studied.