Spectral-Kinetic Coupling and Effect of Microfield Rotation on Stark Broadening in Plasmas

Demura, A. V.; Stambulchik, E.

doi:10.3390/atoms2030334

Cited by 5 publications

(5 citation statements)

References 64 publications

(227 reference statements)

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“…They concluded that such collisions strongly affect the width and shape of the line profile in the core region where the dynamical effects are included using the frequency-fluctuation-model approach. Demura & Stambulchik (2014) have studied the assumption that the density matrix is diagonal for the calculation of spectral lineshapes and the effect of microfield rotation on Stark profiles. The electron-impact broadening of ion lines has been calculated by Naam et al (2014) using trajectories modified by non-Newtonian mechanics and the Maxwell-Jüttner velocity distribution.…”

Section: Developments In Line Broadening Theorymentioning

confidence: 99%

Division B Commission 14 Working Group: Collision Processes

Peach¹,

Dimitrijević²,

Barklem³

2015

Proc. IAU

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Since our last report (Peach & Dimitrijević 2012), a large number of new publications on the results of research in atomic and molecular collision processes and spectral line broadening have been published. Due to the limited space available, we have only included work of importance for astrophysics. Additional relevant papers, not included in this report, can be found in the databases at the web addresses provided in Section 6. Elastic and inelastic collisions between electrons, atoms, ions, and molecules are included, as well as charge transfer in collisions between heavy particles which can be very important.

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Section: Developments In Line Broadening Theorymentioning

confidence: 99%

Division B Commission 14 Working Group: Collision Processes

Peach¹,

Dimitrijević²,

Barklem³

2015

Proc. IAU

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“…Notably, the effects of the directionality of the microfield fluctuations were first researched within the framework of the "standard theory" of the plasma line broadening almost four decades ago, but have largely been forgotten. This approach is recalled and comparisons with computer simulations are made in the paper by Demura and Stambulchik [5].…”

Section: Hydrogen-like Transitionsmentioning

confidence: 99%

Special Issue on Spectral Line Shapes in Plasmas

Stambulchik

Calisti

Chung

et al. 2014

Atoms

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Line-shape analysis is one of the most important tools for diagnostics of both laboratory and space plasmas. Its reliable implementation requires sufficiently accurate calculations, which imply the use of analytic methods and computer codes of varying complexity, and, necessarily, varying limits of applicability and accuracy. However, studies comparing different computational and analytic methods are almost non-existent. The Spectral Line Shapes in Plasma (SLSP) code comparison workshop series [1] was established to fill this gap.Numerous computational cases considered in the two workshops organized to date (in April 2012 and August 2013 in Vienna, Austria) not only serve the purpose of code comparison, but also have applications in research of magnetic fusion, astrophysical, laser-produced plasmas, and so on. Therefore, although the first workshop was briefly reviewed elsewhere [2], and will likely be followed by a review of the second one, it was unanimously decided by the participants that a volume devoted to results of the workshops was desired. It is the main purpose of this special issue. Hydrogen-Like TransitionsMany calculation cases suggested for the first two SLSP workshops are for simple atomic systems: the hydrogen atom or hydrogen-like one-electron ions. Of these, the Ly-α transition is truly the

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“…A plausible answer is that the magnitude and frequency distributions taken separately are insufficient to describe the full dynamics of the plasma fields and, therefore, evolution of the radiator. Indeed, as a result of plasma particle motion, not only does the total field experienced by the radiator change in magnitude, but its direction is varied as well, and these two effects are not independent [5,6]. The different modes of the microfield fluctuations and respective different effects on line broadening were first analyzed based on, and extending, the framework of the 'standard theory' (ST) of plasma line broadening almost four decades ago [7], and recently became a subject of study again [6,8], this time beyond a perturbative approach.…”

Section: Introductionmentioning

confidence: 99%

“…Following [6,8], one introduces 'rotational' and 'vibrational' pseudocomponents of the total microfield F t , ( ) respectively, where n G is a unity vector aligned, for example, along the z-axis. It was shown [6] that the central part of the Lyman-α Stark profile is largely determined by the 'rotational' perturbation. Furthermore, for the range of plasma parameters considered, the linewidth appeared to scale as v N ,…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Dynamic Stark broadening of Lyman-α

Stambulchik

Demura

2016

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

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Calculating lineshapes of atomic radiative transitions broadened by plasma is a complex problem lacking a general analytic solution, and several models have been suggested to treat it. Lyman-α is the simplest transition; paradoxically however, calculating the broadening of this spectral line in plasma results in a significant spread between different models. Here, we argue that the quasistatic broadening regime is never realized for the line core in a one-component plasma; instead, the broadening due to either electrons or ions alone evolves from the impact regime to another regime, also dynamical in nature. In the latter (referred to here as 'rotational' broadening), the linewidth only depends on the typical frequency of the plasma microfields and is independent of both the microfield magnitudes and the atomic properties of the transition. We also demonstrate that rotational broadening is asymptotically reached in the high-density/lowtemperature limit by other transitions with an unshifted central component, such as the Balmer-α line. A simple expression is suggested interpolating between the two asymptotic regimes, applicable to broadening due to electrons and ions alike. The treatment is further extended to realistic two-component plasmas. Comparison to results of accurate computer simulations shows a good agreement over a very large range of plasma parameters, both for the case of one-and two-component plasmas.

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Spectral-Kinetic Coupling and Effect of Microfield Rotation on Stark Broadening in Plasmas

Cited by 5 publications

References 64 publications

Division B Commission 14 Working Group: Collision Processes

Division B Commission 14 Working Group: Collision Processes

Special Issue on Spectral Line Shapes in Plasmas

Dynamic Stark broadening of Lyman-α

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