Scaling of hydrogen electron stark widths at high densities and theInglis–Teller limit

Alexiou, S.

doi:10.1016/j.hedp.2009.03.008

Cited by 4 publications

(2 citation statements)

References 15 publications

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“…However, such a treatment is allowed for weak collisions only. Dealing with strong collisions [46,47,48], a low-order perturbative treatment even for the electron-atom interaction leads to an overestimation of strong-collision contributions [49]. Within a semi-classical treatment of the electron-radiator collisions, a low-order perturbative expansion produces even divergent integrals for shift and width.…”

Section: Strong Collisionsmentioning

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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Section: Strong Collisionsmentioning

confidence: 99%

Electron Broadening Operator Including Penetrating Collisions for Hydrogen

Pain

Gilleron

2020

Atoms

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“…It is seen that for the higher series members in all cases, the maximum impact parameter is comparable to the relevant wavefunction extent. Hence, strong collisions and penetration are potentially important, at least for the higher series members [4]. …”

Section: Strong Collisions and Penetrationmentioning

confidence: 99%

The Fourth Workshop on Lineshape Code Comparison: Line Merging

Alexiou

Stambulchik

Gomez

et al. 2018

Atoms

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Abstract:For a given set of plasma parameters, along a single series (Lyman, Balmer, etc.) the lines with higher principal quantum number (n) lines get progressively wider, closer to each other, and start merging for a certain critical n. In the present work, four different codes (with further options) are used to calculate the entire Balmer series for moderate and high electron densities. Particular attention is paid to the relevant physics, such as the cutoff criteria, strong and penetrating electron collisions.

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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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Scaling of hydrogen electron stark widths at high densities and theInglis–Teller limit

Cited by 4 publications

References 15 publications

Electron Broadening Operator Including Penetrating Collisions for Hydrogen

Electron Broadening Operator Including Penetrating Collisions for Hydrogen

The Fourth Workshop on Lineshape Code Comparison: Line Merging

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

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