A brief review of the intensity of lines 3C and 3D in neon-like Fe XVII

Brown, G. V.

doi:10.1139/p07-158

Cited by 22 publications

(18 citation statements)

References 74 publications

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“…It also reveals that the discrepancy does not originate in certain effects related to chord-integrated information. Although there is no atomic theory explaining the discrepancy at present, the result from the EBIT at Lawrence Livermore National Laboratory (LLNL) suggests that the excitation cross section of the 3C transition in the theoretical calculation is obviously underestimated while the cross section of the 3D transition is in good agreement with theory [21]. A recent study on the oscillator strength of 3C/3D suggests that the discrepancy is caused by the accuracy in the atomic wave functions [22].…”

Section: Analysis Of the Emissivity Ratios Among Fexvii N = 3-2 Tmentioning

confidence: 98%

Radial profiles and emissivity ratio analysis of Ne-like FeXVII n = 3−2 transitions in Large Helical Device

Huang

Wang

Dong

et al. 2014

Journal of the Korean Physical Society

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The radial profiles of the FeXVII 3s-2p and 3d-2p transitions emitted in the wavelength range of 15 − 17Å have been observed in the Large Helical Device (LHD). The chord-integrated radial profiles are converted into radial emissivity profiles by means of Abel inversion. The emissivity ratios among FeXVII n = 3-2 transitions calculated from the radial emissivity profiles are compared with calculations based on a collisional-radiative (CR) model developed for Fe ions. The result reasonably confirms the effect of electron temperature and density on the emissivity ratio. However, the emissivity of the 3C (2p 5 3d 1 P1 → 2p 6 ) transition is obviously lower than the prediction from the CR model. This discrepancy is consistent with measurements in the solar corona and other laboratory plasmas.

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Section: Analysis Of the Emissivity Ratios Among Fexvii N = 3-2 Tmentioning

confidence: 98%

Radial profiles and emissivity ratio analysis of Ne-like FeXVII n = 3−2 transitions in Large Helical Device

Huang

Wang

Dong

et al. 2014

Journal of the Korean Physical Society

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“…The first article [6] concerned the ratio of two 3d À 2p xray emission lines, referred to as 3C and 3D, in Ne-like iron. The 3C/ 3D line intensity ratio is an important diagnostic in interpreting a variety of astrophysical spectra, such as x-ray observations of stellar coronae [7].…”

Section: Ironmentioning

confidence: 99%

Relativistic opacities for astrophysical applications

Fontes

Fryer

Hungerford

et al. 2015

High Energy Density Physics

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a b s t r a c tWe report on the use of the Los Alamos suite of relativistic atomic physics codes to generate radiative opacities for the modeling of astrophysically relevant plasmas under local thermodynamic equilibrium (LTE) conditions. The atomic structure calculations are carried out in fine-structure detail, including full configuration interaction. Three example applications are considered: iron opacities at conditions relevant to the base of the solar convection zone, nickel opacities for the modeling of stellar envelopes, and samarium opacities for the modeling of light curves produced by neutron star mergers. In the first two examples, comparisons are made between opacities that are generated with the fully and semirelativistic capabilities in the Los Alamos suite of codes. As expected for these highly charged, ironpeak ions, the two methods produce reasonably similar results, providing confidence that the numerical methods have been correctly implemented. However, discrepancies greater than 10% are observed for nickel and investigated in detail. In the final application, the relativistic capability is used in a preliminary investigation of the complicated absorption spectrum associated with cold lanthanide elements.

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“…EBIT-II is an electron beam ion trap at Lawrence Livermore National Laboratory in Livermore, California [5], that has been optimized for laboratory astrophysics measurements [6,7,8]. Measurements on EBIT-II utilized similar techniques as those described in earlier measurements of the iron emission [9,10,11,12].…”

Section: Spectroscopic Measurementsmentioning

confidence: 99%