https://aip.scitation.org/doi/pdf/10.1016/j.mre.2016.10.002

Review of quantum collision dynamics in Debye plasmas

The 2s 21 S e autoionization resonance state of the hydrogen negative ion embedded in Debye plasmas is determined by calculating the density of resonance states using the stabilization method. The electron affinity of the hydrogen atom is also estimated for various Debye lengths.A screened Coulomb potential obtained from the Debye model is used to represent the interaction between the charged particles. A correlated wave function consisting of a generalized exponential expansion has been used to represent the correlation effect between the three charged particles. The screening effect is taken care of forallpairsofthechargedparticles.Thecalculatedresonanceenergiesandwidths for various Debye parameters ranging from infinity to a small value along with the electron affinity are reported.

https://iopscience.iop.org/article/10.1088/1367-2630/7/1/141/pdf

Electron affinity of the hydrogen atom and a resonance state of the hydrogen negative ion embedded in Debye plasmas

Hot, dense plasmas exhibit screened Coulomb interactions, resulting from the collective effects of correlated many-particle interactions. In the lowest particle correlation order (pair-wise correlations), the interaction between charged plasma particles reduces to the Debye-Huckel (Yukawa-type) potential, characterized by the Debye screening length D. Due to the importance of Coulomb interaction screening in dense laboratory and astrophysical plasmas, hundreds of theoretical investigations have been carried out in the past few decades on the plasma screening effects on the electronic structure of atoms and their collision processes employing the Debye-Huckel screening model. The present article aims at providing a comprehensive review of the recent studies in atomic physics in Debye plasmas. Specifically, the work on atomic electronic structure, photon excitation and ionization, electron/positron impact excitation and ionization, and excitation, ionization and charge transfer of ion-atom/ion collisions will be reviewed.

A review of quantum collision dynamics in Debye plasmas

Doubly-excited 2s21Se resonance state of helium embedded in Debye plasmas

We have made an investigation on the $2{s}^{2}\text{ }{^{1}S}^{e}$ resonances in helium (He) in exponential cosine-screened Coulomb potentials (ECSCP). Highly correlated wave functions are used to take into account of the correlation effect of the charged particles. Resonance energies and widths for the doubly excited He in ECSCP are determined using the stabilization method by calculating the density of the resonance states. Results for resonance energies and widths are reported for the screening parameter in the range 0.0--0.275

Doubly excited resonance states of helium in exponential cosine-screened Coulomb potentials

We have made an attempt to investigate atomic resonances in various Debye plasma environments. The $2{s}^{2}\phantom{\rule{0.3em}{0ex}}^{1}S^{e}$ autoionization resonance for a two-electron system ${\mathrm{H}}^{\ensuremath{-}}$ is determined by calculating the density of resonance states using the stabilization method. Highly correlated Hylleraas-type wave functions are used to represent the correlation effects between the three charged particles. The calculated resonance energies and widths for the various Debye parameters ranging from infinity to a small value are reported.

Autoionizing 1Se resonance of H- in Debye plasma environments.

We have made an investigation on the resonances for positronium negative ion ${\mathrm{Ps}}^{\ensuremath{-}}$ in various model plasma environments. The $2{s}^{2}\phantom{\rule{0.2em}{0ex}}^{1}S^{e}$ autoionization resonance state in ${\mathrm{Ps}}^{\ensuremath{-}}$ ion is determined by calculating the density of resonance states using the stabilization method. We have also performed accurate variational calculations to obtain ground-state energy eigenvalues of ${\mathrm{Ps}}^{\ensuremath{-}}$ for various Debye lengths. A screened Coulomb potential obtained from the Debye model is used to represent the interaction between the charged particles. A correlated wave function has been used to represent the correlation effect between the three charge particles. The calculated resonance energies and widths for various Debye parameters ranging from infinity to a small value along with the ground-state energies are reported.

Ground state and resonance state of Ps − in plasmas with various Debye lengths

We have made an investigation on the 2s2p {sup 1,3}P{sup o} resonance states of helium embedded in dense plasma environments. A screened Coulomb potential obtained from the Debye model is used to represent the interaction between the charge particles. A correlated wave function consisting of a generalized exponential expansion has been used to represent the correlation effect. Resonance energies and widths for the doubly excited He embedded in plasmas with various Debye lengths are determined using the stabilization method by calculating the density of resonance states. The resonance energies and widths for various Debye parameters ranging from infinity to a small value for the lowest {sup 1,3}P{sup o} resonance states are reported.

Doubly excited 2 s 2 p P o 1 , 3 resonance states of helium in dense plasmas

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