Excited spectator electron effects on spectral line shapes

Iglesias, Carlos A.

doi:10.1016/j.hedp.2010.01.007

Cited by 14 publications

(9 citation statements)

References 31 publications

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“…As expected from previous results [15,16], we found that including the interference term in the electron broadening produces negligible changes in the n ¼ 2 satellites, minor changes in the n ¼ 3 satellites, and significant narrowing in the n ¼ 4 satellites. It is likely that the line-narrowing trend continues for higher-n satellites.…”

Section: Discussionsupporting

confidence: 91%

The effect of improved satellite line shapes on the argon Heβ spectral feature

Mancini

Iglesias

Ferri

et al. 2013

High Energy Density Physics

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Section: Discussionsupporting

confidence: 91%

The effect of improved satellite line shapes on the argon Heβ spectral feature

Mancini

Iglesias

Ferri

et al. 2013

High Energy Density Physics

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“…PPP accounts for all the main mechanisms of line broadening: lifetime broadening due to spontaneous emission, Stark broadening. Particular attention is payed to interference effects [12] which turned out to be a major player for the contour shape analysis [13,14].…”

Section: Introductionmentioning

confidence: 99%

Interference effects and Stark broadening in XUV intrashell transitions in aluminum under conditions of intense XUV free-electron-laser irradiation

et al. 2013

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Quantum mechanical interference effects in the line broadening of intra-shell transitions are investigated for dense plasma conditions. Simulations that involved LSJ-split level structure and intermediate coupling discovered unexpected strong line narrowing for intra-shell transitions L-L while M-L transitions remained practically unaffected by interference effects. This behaviour allows a robust study of line narrowing in dense plasmas. Simulations are carried out for XUV transitions of aluminum that have recently been observed in experiments with the FLASH Free Electron Laser irradiating solid aluminum samples with intensities greater than 10 16 W/cm 2 . We explore the advantageous case of Al that allows first, simultaneous observation of M-L transitions and L-L intra-shell transitions with high resolution grating spectrometers and, second, has a convenient threshold to study interference effects at densities much below solid. Finally we present simulations at near solid density where the line emission transforms into a quasi-continuum.

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“…It has been shown that the electron impact broadening of such features is intricate, requiring the contributions from the interference terms that cause overlapping lines to coalesce such that the spectator-electron relaxation does not affect the line shape, i.e., narrower lines with restricted wings [91]. Electron impact broadening of resonances in the close-coupling formalism is also currently under review 9 .…”

Section: Spectator-electron Processesmentioning

confidence: 99%

Computation of Atomic Astrophysical Opacities

Mendoza

2018

Atoms

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Abstract:The revision of the standard Los Alamos opacities in the 1980-1990s by a group from the Lawrence Livermore National Laboratory (OPAL) and the Opacity Project (OP) consortium was an early example of collaborative big-data science, leading to reliable data deliverables (atomic databases, monochromatic opacities, mean opacities, and radiative accelerations) widely used since then to solve a variety of important astrophysical problems. Nowadays the precision of the OPAL and OP opacities, and even of new tables (OPLIB) by Los Alamos, is a recurrent topic in a hot debate involving stringent comparisons between theory, laboratory experiments, and solar and stellar observations in sophisticated research fields: the standard solar model (SSM), helio and asteroseismology, non-LTE 3D hydrodynamic photospheric modeling, nuclear reaction rates, solar neutrino observations, computational atomic physics, and plasma experiments. In this context, an unexpected downward revision of the solar photospheric metal abundances in 2005 spoiled a very precise agreement between the helioseismic indicators (the radius of the convection zone boundary, the sound-speed profile, and helium surface abundance) and SSM benchmarks, which could be somehow reestablished with a substantial opacity increase. Recent laboratory measurements of the iron opacity in physical conditions similar to the boundary of the solar convection zone have indeed predicted significant increases (30-400%), although new systematic improvements and comparisons of the computed tables have not yet been able to reproduce them. We give an overview of this controversy, and within the OP approach, discuss some of the theoretical shortcomings that could be impairing a more complete and accurate opacity accounting.

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Excited spectator electron effects on spectral line shapes

Cited by 14 publications

References 31 publications

The effect of improved satellite line shapes on the argon Heβ spectral feature

The effect of improved satellite line shapes on the argon Heβ spectral feature

Interference effects and Stark broadening in XUV intrashell transitions in aluminum under conditions of intense XUV free-electron-laser irradiation

Computation of Atomic Astrophysical Opacities

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