X-ray spectroscopy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>E</mml:mi><mml:mn>2</mml:mn></mml:mrow></mml:math>and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mi>M</mml:mi><mml:mn>3</mml:mn></mml:mrow></mml:math>transitions in Ni-like W

Clementson, J.; Beiersdörfer, P.; Gu, M. F.

doi:10.1103/physreva.81.012505

Cited by 63 publications

(86 citation statements)

References 45 publications

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“…Though quite recent, FAC has become of widespread use in various research fields, and its precision has been widely tested by experiments (for instance: Aggarwal et al 2010;Aggarwal et al 2011;Clementson et al 2010;Hahn et al 2010;Wei et al 2010). The versatility and speed of FAC allowed us by running numerous test cases to systematically construct a coherent and homogeneous set of data for nineteen ions of scandium.…”

Section: Introductionmentioning

confidence: 99%

Extensive spectroscopic data for multiply ionized scandium: Sc III to Sc XXI

Massacrier

Artru

2012

A&A

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Context. Spectroscopic data for scandium is sparse, while an extensive set is needed to introduce this element into stellar opacity calculations and, more importantly, into stellar models dealing with radiative diffusion. Aims. Our goal is to provide extensive energy levels and radiative transitions data for nineteen ionization stages of scandium relevant to stellar interiors, namely from Sc iii to Sc xxi. Methods. We used the FAC code. This code provides ab initio theoretical values for energy levels in j j-coupling and oscillator strengths of all permitted transitions. Detailed correspondences are established with compiled data from the National Institute of Standards and Technology (NIST) database, to locate as much as possible the observed levels and lines at their experimental values and to estimate the quality of our data. Comparison were also made with the spectroscopic data delivered by Kurucz. Results. The theoretical data retained in tables include 21 842 levels and more than two millions transtions. By comparison, the NIST compilation gives a total of 820 levels and 677 g f -values. The good agreement obtained when comparing the new data with those of the NIST compilation demonstrates their quality. This work on scandium shows that the FAC code is efficient in providing spectrocopic data that are unavailable from laboratory analyses but necessary for accurate simulations of stellar plasmas.

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Section: Introductionmentioning

confidence: 99%

Extensive spectroscopic data for multiply ionized scandium: Sc III to Sc XXI

Massacrier

Artru

2012

A&A

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“…While excitations from the ground state are generally polarizationsensitive, the radiative cascades smear out polarization signatures for the lowest levels. This was explicitly shown in the recent study of electric-quadrupole and magneticoctupole lines in Ni-like W 46+ [43]. A significant advantage of the experimental method presented here consists in its ability to provide simultaneous resolved measurements of dielectronic resonances from several ions.…”

Section: Comparisons and Discussionmentioning

confidence: 84%

AnisotropicLMNdielectronic resonances from ratios of magnetic-dipole lines

Ralchenko

Gillaspy

2013

Phys. Rev. A

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Signatures of multi-keV LM N dielectronic resonances in highly-charged 3d n ions of tungsten were detected in the intensity ratios of extreme-ultraviolet magnetic-dipole lines within ground configurations. The measurements were performed with an electron beam ion trap at beam energies of about 6 keV. Large-scale collisional-radiative modeling incorporating magnetic sublevels of autoionizing levels showed the significance of anisotropy effects due to the monodirectional propagation of the electron beam. The observation method allows simultaneous resolved registration of dielectronic resonances from several ions.

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“…X-ray spectroscopy utilizing emissions from L-shell as well as M-shell tungsten ions is an attractive option for tokomak plasma diagnostics [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22]. The temperature of the ITER core will be sufficiently high to produce the L-shell tungsten ionic charged states.…”

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confidence: 99%

“…In this context, we have performed fully relativistic distorted wave (RDW) calculations to obtain cross-sections for various M-and L-shell transitions due to electron impact excitation of highly charged tungsten ions W n+ where n varies from 44 to 66. This work is undertaken in the light of recent measurements in an electron beam ion trap at the Lawrence Livermore National Laboratory reported by Beiersdorfer and his co-workers [19][20][21][22] in which they identified a number of intense lines in the L-and M-shell spectra of various tungsten ions. The electron excitation processes corresponding to these lines are studied in detail due to the importance of the cross-section data to identify and interpret the spectroscopic data of the tungsten ions.…”

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Fully Relativistic Electron Impact Excitation Cross-Section and Polarization for Tungsten Ions

Priti

Dipti

Sharma

et al. 2015

Atoms

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Electron impact excitation of highly charged tungsten ions in the framework of a fully relativistic distorted wave approach is considered in this paper. Calculations of electron impact excitation cross-sections for the M-and L-shell transitions in the tungsten ions W n+ (n = 44-66) and polarization of the decay of photons from the excited tungsten ions are briefly reviewed and discussed. New calculations in the wide range of incident electron energies are presented for M-shell transitions in the K-like through Ne-like tungsten ions.

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X-ray spectroscopy ofE2andM3transitions in Ni-like W

Cited by 63 publications

References 45 publications

Extensive spectroscopic data for multiply ionized scandium: Sc III to Sc XXI

Extensive spectroscopic data for multiply ionized scandium: Sc III to Sc XXI

AnisotropicLMNdielectronic resonances from ratios of magnetic-dipole lines

Fully Relativistic Electron Impact Excitation Cross-Section and Polarization for Tungsten Ions

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