Exact expression of the impact broadening operator for hydrogen Stark broadening

Ma, Guojun; González, Manuel Á.; Talin, B.; Calisti, A.

doi:10.1051/0004-6361:20066920

Cited by 17 publications

(31 citation statements)

References 22 publications

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“…Figure 5 shows the FWHM of the He I 7281 line as a function of the electron density for the studied temperatures. For this spectral line it can be observed that the relation between the FWHM and N has a functional dependence on the exponent g(N e , T ) that is practically independent of the density and temperature and very close to the value g ≈ 1, as expected from spectra whose width is caused basically by electron impact (Griem 1974;Gigosos et al 2007).…”

Section: Calculation Resultssupporting

confidence: 70%

“…Naturally, the characteristic time of the dynamic of the electronic fields is much lower than the loss the correlation time of the emitter dipole at very low densities, when the typical Stark effect is very weak and the lines are narrow. Under these circumstances, the considerations of the impact model are very convenient (Gigosos et al 2007) and the simulations perfectly reproduce that situation: the width and the shift of the lines are linear with the electron density and fit to the so-called impact limit.…”

Section: Comparison With Other Resultsmentioning

confidence: 91%

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Stark broadening of lines from transition between statesn = 3 ton = 2 in neutral helium

Djurović

Savić

et al. 2014

A&A

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Context. The Stark broadening of the spectral lines of the wavelengths 501. 6, 667.8, 728.1, 388.9, 587.6, and 706.5 nm from neutral helium in plasmas are studied theoretically and experimentally. Aims. The aim of this work is to provide information about the connection between the shape and width of spectral lines and the electron density and temperature to be used as a diagnostic tool. Methods. The theoretical calculations were carried out through molecular dynamics computer simulations with noninteracting particles. The experimental measurements were done in a plasma of pure helium generated in an electromagnetically driven T-tube. The plasma diagnostics used previous results about the Stark broadening of the He I 447.1 nm and He I 492.2 nm lines and the coherence between the shape of these spectra and those obtained here. The electron temperature was obtained through a Boltzmann-plot of eight lines of Si II. Results. Several tables of width and shift are provided in a wide range of electron density and temperature. Furthermore, we supply several fitting formulas, which allow calculating the plasma electron density from the measured values of the spectral line widths. The results obtained in the laboratory and in the simulations are compared with the data from the literature.

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Section: Calculation Resultssupporting

confidence: 70%

Section: Comparison With Other Resultsmentioning

confidence: 91%

Stark broadening of lines from transition between statesn = 3 ton = 2 in neutral helium

Djurović

Savić

et al. 2014

A&A

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“…More than thirty years ago, a discussion took place about the physical meaning of the so-called interference term [26,27,28,29,30]. That term does not account for any physical requirement: it results from a mathematical expansion in power series.…”

Section: The Collision Operator 21 General Formmentioning

confidence: 99%

Electron Broadening Operator Including Penetrating Collisions for Hydrogen

Pain

Gilleron

2020

Atoms

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The expression of the electron broadening operator including the effect of penetrating collisions, i.e. for which the incoming electron enters the extent of bound-electron wavefunctions, is rather complicated, even for hydrogen. It involves integrals of special functions, which evaluation deserves scrutiny. We present a simple approximate form of the electron collision operator for hydrogen including penetration effects, both in direct and interference terms. The new expression is accurate and easy to compute. In the Penetration Standard Theory, the collision operator is convergent whatever the value of the maximum impact parameter. However, when penetration theory is not valid anymore, it should be questioned. We discuss the problem of strong collisions when penetration effects are taken into account.

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“…Poquérusse & Alexiou (2006) have extended standard semi-classical impact theory for hydrogen-like ions to include penetrating collisions. For transitions in highly excited hydrogen-like atoms and ions Stambulchik & Maron (2008) have produced a simple analytical method for calculating line shapes and Gigosos et al (2007) have developed an exact expression for the impact broadening operator of hydrogen. The asymmetry of hydrogen lines has been studied by Demura et al (2008a) and Demura et al (2008b).…”

Section: Stark Broadeningmentioning

confidence: 99%

Division Xii / Commission 14 / Working Group Collision Processes

Peach¹,

Dimitrijević²,

Stancil³

2008

Proc. IAU

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Research in atomic and molecular collision processes and spectral line broadening has been very active since our last report (Schultz & Stancil 2007, Allard & Peach 2007). Given the large volume of the published literature and the limited space available, we have attempted to identify work most relevant to astrophysics. Since our report is not comprehensive, additional publications can be found in the databases at the web addresses listed in the final section. Elastic and inelastic collisions among electrons, atoms, ions, and molecules are included and reactive processes are also considered, but except for charge exchange, they receive only sparse coverage.

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Exact expression of the impact broadening operator for hydrogen Stark broadening

Cited by 17 publications

References 22 publications

Stark broadening of lines from transition between statesn = 3 ton = 2 in neutral helium

Stark broadening of lines from transition between statesn = 3 ton = 2 in neutral helium

Electron Broadening Operator Including Penetrating Collisions for Hydrogen

Division Xii / Commission 14 / Working Group Collision Processes

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