Comment on ‘‘Shifts of hydrogen lines from electron collisions in dense plasmas’’

Iglesias, CA; Boercker, DB; Rw, Lee

doi:10.1103/physreva.32.1906

Cited by 6 publications

(3 citation statements)

References 5 publications

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“…Furthermore, the intrinsically non-unique choice of a cutoff parameter remains unsatisfactory. Whereas for linewidth calculations such a cutoff procedure has been proven to be successful, for the line shift a cutoff procedure is problematic [54]. Further, it remains an open question whether there are strong-collision contributions to the line shift at all.…”

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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“…The idea of PPS was elaborated, developed [99,153,154,156,170,[172][173][174]176,182,185] and criticized [160,167,175] in a great number of papers, and it is impossible to point out all of them here. As it was noted in [160], the PPS results, classified in [160] as the effect of initial electron correlations [161][162][163][164][165]167], could substantially overestimate the observations, because of the unaccounted for frequency-dependent dynamic contribution to the ion line shift [160,167,177], related to the dynamic screening of the electron perturbers in plasma [162,167].…”

Section: Appendix a On Theoretical Shifts Of Hydrogenlike Emittersmentioning

confidence: 99%

“…At last the procedures of calculations of these shifts were adjusted in the papers of Griem, Boercker, Iglesias and Lee [165,166,169,171]. As follows from the consideration presented in [171], the main cause of the Boercker-Iglesias dipole shifts with ∆n = 0 [150] or equivalently from the TPGF technique [113,114,120,123,168] in the impact limit, the high temperature approximation and neglect of the electron correlations is the dropping of the approximation of the constant momentum of the electron perturber during collision with the target.…”

Section: Appendix a On Theoretical Shifts Of Hydrogenlike Emittersmentioning

confidence: 99%

Beyond the Linear Stark Effect: A Retrospective

Demura

2018

Atoms

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Shifts of hydrogen and ionized-helium lines fromΔn=0interactions with electrons in dense plasmas

Griem

1988

Phys. Rev. A

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Shifts from electron collisions associated with dipole interactions between degenerate levels of a given principal quantum number n are evaluated following D. B. Boercker and C. A. Iglesias [Phys. Rev. A 30, 2771]. They are then used to recalculate the plasma shifts of hydrogen and ionized-helium lines from electron collisions, inhomogeneities in the ion-produced quasistatic fields, and some higher-order effects. Because of the partial cancellation of electron collisional shifts by the other effects, inclusion of the An =0 collisional shifts leads to an increase of calculated line shifts by a factor -1.5, which for Balmer lines of hydrogen and Paschen lines of ionized helium leads to markedly improved agreement with most measurements. Estimates for higher-Z members (Z )4) of the one-electron isoelectronic sequence yield An =0, dipole contributions to the electroncollisional shifts which are much smaller than the effects of A=O, penetrating monopole interactions.

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Comment on ‘‘Shifts of hydrogen lines from electron collisions in dense plasmas’’

Cited by 6 publications

References 5 publications

Electron Broadening Operator Including Penetrating Collisions for Hydrogen

Electron Broadening Operator Including Penetrating Collisions for Hydrogen

Beyond the Linear Stark Effect: A Retrospective

Shifts of hydrogen and ionized-helium lines fromΔn=0interactions with electrons in dense plasmas

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