Spectra of heliumlike carbon, aluminium and argon under strongly coupled plasma

Sil, A. N.; Anton, J.; Fritzsche, S.; Mukherjee, P. K.; Fricke, B.

doi:10.1140/epjd/e2009-00258-6

Cited by 32 publications

(29 citation statements)

References 31 publications

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“…From the plot we can see that the IPs decrease monotonically with decreasing the ion sphere radius R. The decaying trends in the plots mean growing instability in the system with the rise of ion density in the strong plasma environment. Similar pattern was also observed by Sil et al [43] for the plasma embedded Al 11+ ion in the same IS model analysis.…”

Section: B Results From Is Modelsupporting

confidence: 89%

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: B Results From Is Modelsupporting

confidence: 89%

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

2016

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“…In table 10, we have displayed the comparison of present results for transition energies of C 4+ , Al 11+ and Ar 16+ with experimental measurements [22][23][24] and existing theoretical calculations [36]. Table-10 clearly depicts that the present results are in good agreement with the experimental measurements as compared to other theoretical results.…”

supporting

confidence: 72%

Nonrelativistic structure calculations of two-electron ions in a strongly coupled plasma environment

Bhattacharyya¹,

Saha

Mukherjee³

2015

Phys. Rev. A

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In this work, the controversy between the interpretations of recent measurements on dense aluminum plasma created with Linac coherent light sources (LCLS) X-ray free electron laser (FEL) and Orion laser has been addressed. In both kind of experiments, helium-like and hydrogen-like spectral lines are used for plasma diagnostics . However, there exist no precise theoretical calculations for He-like ions within dense plasma environment. The strong need for an accurate theoretical estimates for spectral properties of He-like ions in strongly coupled plasma environment leads us to perform ab initio calculations in the framework of Rayleigh-Ritz variation principle in Hylleraas coordinates where ion-sphere potential is used. An approach to resolve the long-drawn problem of numerical instability for evaluating two-electron integrals with extended basis inside a finite domain is presented here. The present values of electron densities corresponding to disappearance of different spectral lines obtained within the framework of ion-sphere potential show excellent agreement with Orion laser experiments in Al plasma and with recent theories. Moreover, this method is extended to predict the critical plasma densities at which the spectral lines of H-like and He-like carbon and argon ions disappear. Incidental degeneracy and level-crossing phenomena are being reported for the first time for two-electron ions embedded in strongly coupled plasma. Thermodynamic pressure experienced by the ions in their respective ground states inside the ion-spheres are also reported.

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“…It should be noted that there have been published a series of papers [5][6][7][8][9][10][11][12] devoted to calculations of plasma effects on atomic spectra mostly employing the Debye potential or its generalization. They provide a high precision of calculations from the atomic physics point of view (using correlated atomic state functions, variation principles, etc.)…”

Section: Introductionmentioning

confidence: 99%

Effect of dense plasmas on exchange-energy shifts in highly charged ions: An alternative approach for arbitrary perturbation potentials

2011

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An alternative method of calculation of dense plasma effects on exchange-energy shifts E x of highly charged ions is proposed which results in closed expressions for any plasma or perturbation potential. The method is based on a perturbation theory expansion for the inner atomic potential produced by charged plasma particles employing the Coulomb Green function method. This approach allows us to obtain analytic expressions and scaling laws with respect to the electron temperature T, density n e , and nuclear charge Z. To demonstrate the power of the present method, two specific models were considered in detail: the ion sphere model (ISM) and the Debye screening model (DSM). We demonstrate that analytical expressions can be obtained even for the finite temperature ISM. Calculations have been carried out for the singlet 1s2p 1 P 1 and triplet 1s2p 3 P 1 configurations of He-like ions with charge Z that can be observed in dense plasmas via the He-like resonance and intercombination lines. Finally we discuss recently available purely numerical calculations and experimental data.

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Spectra of heliumlike carbon, aluminium and argon under strongly coupled plasma

Cited by 32 publications

References 31 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

Nonrelativistic structure calculations of two-electron ions in a strongly coupled plasma environment

Effect of dense plasmas on exchange-energy shifts in highly charged ions: An alternative approach for arbitrary perturbation potentials

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