Ion Dynamics Effect on Stark-Broadened Line Shapes: A Cross-Comparison of Various Models

Ferri, S.; Calisti, A.; Mossé, C.; Rosato, J.; Talin, B.; Alexiou, S.; Ma, Guojun; González, Manuel Á.; González-Herrero, Diego; Lara, N.; Gomez, Thomas; Iglesias, Carlos A.; Lorenzen, S.; Mancini, Roberto; Stambulchik, E.

doi:10.3390/atoms2030299

Cited by 48 publications

(50 citation statements)

References 44 publications

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“…In order to get a dipole autocorrelation function sufficiently close to zero at large times, we have taken 10 6 time steps. Our simulation (not presented at the Workshop 2013 edition) is in agreement with the other simulation codes presented at the Workshop [10]. These codes also assumed several thousands of particles.…”

Section: Questioning the Validity Of Simulationssupporting

confidence: 72%

Ideal Coulomb Plasma Approximation in Line Shape Models: Problematic Issues

Rosato

Capes

Stamm

2014

Atoms

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In weakly coupled plasmas, it is common to describe the microfield using a Debye model. We examine here an "artificial" ideal one-component plasma with an infinite Debye length, which has been used for the test of line shape codes. We show that the infinite Debye length assumption can lead to a misinterpretation of numerical simulations results, in particular regarding the convergence of calculations. Our discussion is done within an analytical collision operator model developed for hydrogen line shapes in near-impact regimes. When properly employed, this model can serve as a reference for testing the convergence of simulations.

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Section: Questioning the Validity Of Simulationssupporting

confidence: 72%

Ideal Coulomb Plasma Approximation in Line Shape Models: Problematic Issues

Rosato

Capes

Stamm

2014

Atoms

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“…Most efforts to treat the observed, strong dependence on perturber ion masses involve some extension of the standard theory, specifically, the new dynamical effects of the radiator-(ion microfield) interaction still are treated separately from the dynamical (i.e., collisional) effects of interactions with plasma electrons [46][47][48][49][50]. All-particle MD is ideally suited to an alternative, unified line-shape prescription in which the field history !…”

Section: Discussionmentioning

confidence: 99%

Microfield dynamics in dense hydrogen plasmas with high-Zimpurities

Hau‐Riege

Weisheit

2017

Phys. Rev. E

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We use large-scale classical molecular dynamics to determine microfield properties for several dense plasma mixtures. By employing quantum statistical potentials (QSPs) to regularize the Coulomb interaction, our simulations follow motions of electrons as well as ions for times long enough to track relaxation phenomena involving both types of particles. Coulomb coupling, relative to temperature, of different pairs of species in the hot, dense matter being simulated ranges from weak to strong. We first study the effect of such coupling differences, along with composition and QSP differences, on the roles of electrons and various mixture components in determining probability distributions of instantaneous, total microfields experienced by the ions. Then, we address two important dynamical questions: (1) how is the quasi-static part of the total field to be extracted from the timedependent simulation data; and, (2) under what conditions does the commonly used approximation of ions with fixed Yukawa-like screening by free electrons accurately describe quasi-static fields? We identify a running, short-time average of the total field at each ion as its slowly evolving, quasi-static part. We consider several ways to specify the averaging interval, and note the influence of ion dynamics in this issue. When all species are weakly coupled, the quasi-static fields have probability distributions agreeing well with those we obtain from simulations of Yukawa-screened ions. However, agreement deteriorates as the coupling between high-Z ions increases well beyond unity, principally because the Yukawa model tends to underestimate the true screening of close high-Z pairs. Examples of this fact are given, and some consequences for the high-field portions of probability distributions are discussed.

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“…Here, g(ω, ω f i ) is the spectral line profile and could be obtained, for instance, as a result of a molecular dynamics (MD) simulations [20][21][22] or as a result of theoretical modeling and spectral line data [23][24][25][26][27]. The lineshape is normalized to unity area, e.g.,…”

Section: The Calculated Quantitiesmentioning

confidence: 99%

The Application of the Cut-Off Coulomb Model Potential for the Calculation of Bound-Bound State Transitions

Sakan

Srećković

Simić

et al. 2018

Atoms

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Abstract:In this contribution, we present results of bound state transition modeling using the cut-off Coulomb model potential. The cut-off Coulomb potential has proven itself as a model potential for the dense hydrogen plasma. The main aim of our investigation include further steps of improvement of the usage of model potential. The results deal with partially ionized dense hydrogen plasma. The presented results covers N e = 6.5 × 10 18 cm −3 , T = 18, 000 K and N e = 1.5 × 10 19 cm −3 , T = 23, 000 K, where the comparison with the experimental data should take place, and the theoretical values for comparison. Since the model was successfully applied on continuous photoabsorption of dense hydrogen plasma in the broad area of temperatures and densities, it is expected to combine both continuous and bound-bound photoabsorption within single quantum mechanical model with the same success.

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Ion Dynamics Effect on Stark-Broadened Line Shapes: A Cross-Comparison of Various Models

Cited by 48 publications

References 44 publications

Ideal Coulomb Plasma Approximation in Line Shape Models: Problematic Issues

Ideal Coulomb Plasma Approximation in Line Shape Models: Problematic Issues

Microfield dynamics in dense hydrogen plasmas with high-Zimpurities

The Application of the Cut-Off Coulomb Model Potential for the Calculation of Bound-Bound State Transitions

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