Atomic data and spectral line intensities for Si XI

Bhatia, A. K.; Landi, E.

doi:10.1016/j.adt.2006.06.002

Cited by 7 publications

(7 citation statements)

References 55 publications

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“…Zhang & Sampson (1992) obtained fully-relativistic distorted wave collision strengths, for transitions within the n = 2 complex, for all of the Be-like ions from O 4+ to U 88+ . More recent fully-relativistic work includes distorted wave data (up to 2p4d and 2s5d) for Si 10+ by Bhatia & Landi (2007) and R-matrix results (up to n = 5) for S 12+ , obtained using the Dirac R-matrix code (DARC) by Li et al (2013).…”

Section: Introductionmentioning

confidence: 99%

R-matrix electron-impact excitation data for the Be-like iso-electronic sequence

Fernández-Menchero

Zanna

Badnell

2014

A&A

162

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Aims. Emission lines from ions in the Be-like isoelectronic sequence can be used for reliable diagnostics of temperature and density of astrophysical and fusion plasmas over a wide range of temperatures. Surprisingly, interpolated data is all that is available for a number of astrophysically important ions. Methods. We have carried out intermediate coupling frame transformation R-matrix calculations which include a total of 238 finestructure levels in both the configuration interaction target and close-coupling collision expansions. These arise from the configurations 1s 2 2{s, p} nl with n = 3−7, and l = 0−4 for n ≤ 5 and l = 0−2 for n = 6, 7. Results. We obtain ordinary collision strengths and Maxwell-averaged effective collision strengths for the electron-impact excitation of all the ions of the Be-like sequence, from B + to Zn 26+ . We compare with previous R-matrix calculations and interpolated values for some benchmark ions. We find good agreement for transitions n = 2−2 with previous R-matrix calculations but some disagreements with interpolated values. We also find good agreement for the most intense transitions n = 2−3 which contribute via cascade to the (n = 2) diagnostic radiating levels.

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Section: Introductionmentioning

confidence: 99%

R-matrix electron-impact excitation data for the Be-like iso-electronic sequence

Fernández-Menchero

Zanna

Badnell

2014

A&A

162

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“…In the recent past, we have undertaken a program of developing complete sets of atomic data and transition rates necessary for the calculation of level populations and line intensities for Be-like ions [1][2][3][4][5]. In this paper of the series, we will consider Be-like Ni, or Ni XXV.…”

Section: Introductionmentioning

confidence: 99%

Atomic data and spectral line intensities for Ni XXV

Bhatia

Landi

2009

Atomic Data and Nuclear Data Tables

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“…In the present work, we have adopted the method described by Burgess and Tully [37] to extrapolate collision strengths to the high-and low-energy limit. This method has been used in our earlier papers [1][2][3][4][5][6] and details are given there.…”

Section: Atomic Datamentioning

confidence: 99%

“…In a series of papers, we have recently calculated complete sets of atomic data and transition rates for high-energy configurations of Ni ions [1,2] and of Be-like ions [3][4][5][6] that emit in the soft Xray wavelength range between 20 and 170 Å. These calculations include energy levels, radiative decay rates, and electron-ion excitation rate coefficients, and they were aimed at providing complete datasets needed to compute line emission in a wavelength range that has been neglected in the past, both regarding observations and theoretical calculations.…”

Section: Introductionmentioning

confidence: 99%

Atomic data and spectral line intensities for Ni XVII

Bhatia

Landi

2011

Atomic Data and Nuclear Data Tables

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a b s t r a c tElectron impact collision strengths, energy levels, oscillator strengths, and spontaneous radiative decay rates are calculated for Ni XVII. We include in the calculations the 23 lowest configurations, corresponding to 159 fine-structure levels: 3l3l 0 , 3l4l 00 , and 3s5l 000 , with l, l 0 = s,p,d, l 00 = s, p, d, f, and l 000 = s, p, d. Collision strengths are calculated at five incident energies for all transitions at varying energies above the threshold of each transition. One additional energy, very close to the threshold of each transition, has also been included. Calculations have been carried out using the Flexible Atomic Code in the distorted wave approximation. Additional calculations have been performed with the University College London suite of codes for comparison. Excitation rate coefficients are calculated as a function of electron temperature by assuming a Maxwellian electron velocity distribution. Using the excitation rate coefficients and the radiative transition rates of the present work, statistical equilibrium equations for level populations are solved at electron densities covering the range of 10 8 À 10 14 cm À3 and at an electron temperature of log T e (K) = 6.5, corresponding to the maximum abundance of Ni XVII. Spectral line intensities are calculated, and their diagnostic relevance is discussed. This dataset will be made available in the next version of the CHIANTI database.

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Atomic data and spectral line intensities for Si XI

Cited by 7 publications

References 55 publications

R-matrix electron-impact excitation data for the Be-like iso-electronic sequence

R-matrix electron-impact excitation data for the Be-like iso-electronic sequence

Atomic data and spectral line intensities for Ni XXV

Atomic data and spectral line intensities for Ni XVII

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