Dielectronic satellite spectra for hydrogen-like iron in low density plasmas

Dubau, J.; Gabriel, A. H.; Loulergue, M.; Steenman-Clark, L.; Volonté, S.

doi:10.1093/mnras/195.3.705

Cited by 104 publications

(43 citation statements)

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“…4, we note that the present theoretical and measured values agree very well with each other, and agree with those of Bely-Dubau et aI. [9] for the j1w ratio, and those of Dubau et al [10] for the n2h1Ly. ratio.…”

Section: Measurement and Analysissupporting

confidence: 92%

“…Further improvements to the theory were made in subsequent work, including better inner-shell and He-like CE rates and highern satellite contributions [6][7][8][9]. The satellite lines of H-like iron were investigated by Dubau et al [10]. Vainshtein and Safronova [II,12] also made extensive tabulations of atomic paramete", of H-like and He-like satellite transitions.…”

Section: Introductionmentioning

confidence: 99%

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Laboratory measurements of the dielectronic recombination satellite transitions of He-like Fe XXV and H-like Fe XXVI

Beiersdörfer

Brown

et al. 2012

Can. J. Phys.

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We present laboratory spectra of dielectronic recombination (DR) satellite tnmsitions attached to the He-like and H-like iron resonance lines obtained widt me NASA Goddard Space Flight Center X-ray calorimeter and produced by a thermal plasma simu1ation technique on the EBIT-I electron beam ion trap at the Lawrence Livennore National Laboratory. We demonstrate that the ca10rimeter has sufficient spectral resoiution in the 6-9 keY range to provide reliable measurements not only of standard DR satellite to resonance line intensities but also of DR satellite to DR satellite ratios that can be used to diagnose nonthermal electron distributions. Electron temperatures derived from the measured line intensities are consistent with the temperature of the simulated plasma. Temperature measurements based on DR satellite transitions have significant advantages over those based on collisional ionization equilibrium or continuum shape. Thus, successful demonstration of this method with the X-ray calorimeter is an important step fur its application in X-ray astronomy.

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Section: Measurement and Analysissupporting

confidence: 92%

Section: Introductionmentioning

confidence: 99%

Laboratory measurements of the dielectronic recombination satellite transitions of He-like Fe XXV and H-like Fe XXVI

Beiersdörfer

Brown

et al. 2012

Can. J. Phys.

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“…Spectral lines decaying from doubly excited helium-like ions are essential in understanding the dielectronic recombination process of hydrogen-like ions. The lines that appear as hydrogen-like satellites are often observed in astrophysical plasmas, and the hydrogen-like satellite-to-resonance intensities can be used to measure electron temperatures in solar flares (Dubau et al 1981;Parmar et al 1981;Tanaka 1986;Pike et al 1996). Furthermore, the high-n dielectronic recombination from the hydrogen-like ions can significantly affect some helium-like line ratios from low-lying (n = 2) transitions (Smith et al 2001).…”

Section: Introductionmentioning

confidence: 99%

“…The newly developed X-ray free-electron lasers (FEL) provide a unique opportunity to investigate the behavior of inner-shell vacancy ions (Young et al 2010;Bucksbaum et al 2011;Düsterer et al 2011;Kanter et al 2011;Meyer et al 2012). The theoretical studies of the K-vacancy doubly excited levels of heliumlike ions are mostly based on non-relativistic theory or confined to some selected transitions within 2l2l and 2l3l configurations , 1978, 1980Dubau et al 1981;Safronova & Senashenko 1977;Karim & Bhalla 1986;Mosnier et al 1986;Cornille et al 1990;Deng-Hong et al 2006;Karim 2010;Kadrekar & Natarajan 2011;Natarajan & Kadrekar 2013;Natarajan 2014). The most recent and complete of these studies has been reported by Goryayev et al (2006), who presented the wavelengths and radiative transition probabilities for transitions of 2l 2l − 1s2l and 2l 3l − 1s2l, 1s3l in ions with Z = 6−36 using the Z-expansion method.…”

Section: Introductionmentioning

confidence: 99%

Energy levels and transition rates for helium-like ions withZ = 10–36

Guo

Wang

et al. 2016

A&A

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Aims. Helium-like ions provide an important X-ray spectral diagnostics in astrophysical and high-temperature fusion plasmas. An interpretation of the observed spectra provides information on temperature, density, and chemical compositions of the plasma. Such an analysis requires information for a wide range of atomic parameters, including energy levels and transition rates. Our aim is to provide a set of accurate energy levels and transition rates for helium-like ions with Z = 10-36. Methods. The second-order many-body perturbation theory (MBPT) was adopted in this paper. To support our MBPT results, we performed an independent calculation using the multiconfiguration Dirac-Hartree-Fock (MCDHF) method. Results. We provide accurate energies for the lowest singly excited 70 levels among 1snl (n ≤ 6, l ≤ (n − 1)) configurations and the lowest doubly excited 250 levels arising from the K-vacancy 2ln l (n ≤ 6, l ≤ (n − 1)) configurations of helium-like ions with Z = 10−36. Wavelengths, transition rates, oscillator strengths, and line strengths are calculated for the E1, M1, E2, and M2 transitions among these levels. The radiative lifetimes are reported for all the calculated levels. Conclusions. Our MBPT results for singly excited n ≤ 2 levels show excellent agreement with other elaborate calculations, while those for singly excited n ≥ 3 and doubly excited levels show significant improvements over previous theoretical results. Our results will be very helpful for astrophysical line identification and plasma diagnostics.

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“…"Satellite lines" resulting from dielectric recombination appear with photon energies slightly less than those of the resonance lines, and may be used as temperature diagnostics (Dubau et al 1981). The Ka complexes of helium-like ions break up into resonance (2 1P), intercombination (2 3P) and forbidden (23S) components, the relative strengths of which can be used to infer electron temperature and density (Pradhan and Shull 1981).…”

Section: Optically Thin Thermal Sources a Physical Processesmentioning

confidence: 99%