Dense plasmas, screened interactions, and atomic ionization

Murillo, Michael S.; Weisheit, Jon C.

doi:10.1016/s0370-1573(98)00017-9

Cited by 220 publications

(138 citation statements)

References 69 publications

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“…Accurate estimation of the electronic structures of atoms or ions is one of the active fields of research in the recent years for their wide range of applications [1][2][3]. The plasma may contain different charged species as well as free electrons.…”

Section: Introductionmentioning

confidence: 99%

“…For weakly coupled plasma (Γ ≪ 1; i.e. low density and high temperature), the screening effect can be appropriately described using the Debye model [1]. However, in the strongly coupled plasma (Γ ≫ 1 implying high density and low temperature) ion-sphere (IS) potential model [4] is the best suited model for accounting the plasma screening effects.…”

Section: Introductionmentioning

confidence: 99%

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Plasma screening effects on the electronic structure of multiply charged Al ions using Debye and ion-sphere models

2016

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We analyze atomic structures of plasma embedded aluminum (Al) atom and its ions in the weakly and strongly coupling regimes. The plasma screening effects in these atomic systems are accounted for using the Debye and ion sphere (IS) potentials for the weakly coupling and strongly coupling plasmas, respectively. Within the Debye model, special attention is given to investigate the spherical and non-spherical plasma-screening effects considering in the electron-electron interaction potential. The relativistic coupled-cluster (RCC) method has been employed to describe the relativistic and electronic correlation effects in the above atomic systems. The variation in the ionization potentials (IPs) and excitation energies (EEs) of the plasma embedded Al ions are presented. It is found that the atomic systems exhibit more stability when the exact screening effects are taken into account. It is also showed that in the presence of strongly coupled plasma environment, the highly ionized Al ions show blue and red shifts in the spectral lines of the transitions between the states with same and different principal quantum numbers, respectively. Comparison among the results obtained from the Debye and IS models are also carried out considering similar plasma conditions.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Plasma screening effects on the electronic structure of multiply charged Al ions using Debye and ion-sphere models

2016

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“…The Lorentzian fitting (7) gives the resonance energy E r and resonance width Γ. In the present work, we calculate the densities for each energy level near the avoided crossing and fit with the Lorentzian form (7). Out of all those fittings, the one that gives the best fit (with the least χ-square) to the Lorentzian form is considered as the desired results for that particular resonance.…”

Section: Methods and Calculationsmentioning

confidence: 99%

“…The effect of screened Coulomb interactions among the charged particles in hot and dense plasmas on the structural and collisional properties of atomic systems is a matter of great interest, because it gives us fundamental information for the interpretation of various phenomena associated with plasma physics, astrophysics, and experiments performed with charged particles [1][2][3][4][5][6][7][8][9]. In contrary to a free atomic system, screened Coulomb interactions greatly affect the structural and collisional properties, such as shift of the energy levels, spectral line broadening, change in line shapes, depression of ionization potentials, change of transition properties compared to free systems, and line merging phenomena [10].…”

Section: Introductionmentioning

confidence: 99%

An Investigation on the He−(1s2s2 2S) Resonance in Debye Plasmas

Ghoshal

2017

Atoms

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Abstract:The effect of Debye plasma on the 1s2s 2 2 S resonance states in the scattering of electron from helium atom has been investigated within the framework of the stabilization method. The interactions among the charged particles in Debye plasma have been modelled by Debye-Huckel potential. The 1s2s excited state of the helium atom has been treated as consisting of a He + ionic core plus an electron moving around. The interaction between the core and the electron has then been modelled by a model potential. It has been found that the background plasma environment significantly affects the resonance states. To the best of our knowledge, such an investigation of 1s2s 2 2 S resonance states of the electron-helium system embedded in Debye plasma environment is the first reported in the literature.

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“…Other studies on lowering the ionization energy are summarized in Ref. [28] and, also in the context of electron-ion collision rates, in Refs. [29,30].…”

Section: Introductionmentioning

confidence: 99%

Photoelectron spectroscopy method to reveal ionization potential lowering in nanoplasmas

Ziaja

Jurek

Medvedev

et al. 2013

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

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Abstract. Here we propose a scheme for probing the outer-shell atomic energy levels within a laser-created nanoplasma, using photoelectron spectroscopy data obtained from the irradiation of the nanoplasma with an ultraintense 'probing' pulse from soft X-ray free-electron laser. The proposed method can then detect shifts of outer-shell energy levels of an atom or an ion within a plasma, due to the effect of charged plasma environment on atomic potentials, known as the 'plasma screening effect'. Various theoretical models exist that estimate the magnitude of the screening effect. However, the first experimental data that can verify theoretical models have become available only recently (S. M. Vinko et al., Nature 482, 59 (2012)). They were obtained with a hard X-ray based experimental method which uses the information encoded in fluorescence spectra and is, therefore, restricted to deep atomic shells. Below we show that our photoelectron spectroscopy method of probing a nanoplasma with a destructive, high-intensity soft X-ray pulse that brings the irradiated system to the regime of 'massively parallel' ionization (Ch. Gnodtke, U. Saalmann, J.-M. Rost, Phys. Rev. Lett. 108, 175003 (2012)) enables the access to the information on the energy level (and ultimately energy level shift) of the valence orbital. In particular, the result of such photoelectron spectroscopy experiment could help clarifying the discrepancy between the ion abundances in nanoplasmas observed during the recent high-harmonic-generation and free-electron-laser experiments with intense soft X-ray pulses.

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Dense plasmas, screened interactions, and atomic ionization

Cited by 220 publications

References 69 publications

Plasma screening effects on the electronic structure of multiply charged Al ions using Debye and ion-sphere models

Plasma screening effects on the electronic structure of multiply charged Al ions using Debye and ion-sphere models

An Investigation on the He−(1s2s2 2S) Resonance in Debye Plasmas

Photoelectron spectroscopy method to reveal ionization potential lowering in nanoplasmas

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