Atomic data and spectral line intensities for Ni XXV

Bhatia, A. K.; Landi, E.

doi:10.1016/j.adt.2009.03.001

Cited by 7 publications

(5 citation statements)

References 96 publications

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“…Be-like ions in highly ionized states are commonly found in astrophysical and laboratory plasmas [1][2][3][4]. Understanding the microscopic properties of these plasmas can be aided by investigating the atomic structure parameters of the type Kα satellites in Be-like ions [5][6][7]. Previous studies have already reported experimental data and theoretical calculations for Be-like ions in literature.…”

Section: Introductionmentioning

confidence: 99%

Relativistic configuration-interaction calculations on K_α X-ray satellites of medium-charge Be-like ions

et al. 2024

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This study puts forward a calculation of the transitions of 1s2s22p 1P1-1s22s2 1S0 and 1s2s22p 3P1-1s22s2 1S0 for Be-like ions (Z=6-30) using the multiconfiguration Dirac-Hartree-Fock (MCDHF) and relativistic configuration interaction methods. The computational results include transition wavelengths, transition probabilities, line strengths, and weighted oscillator strengths. The calculations also consider the contributions of the Breit interaction and quantum electrodynamics corrections (QED) to these levels. The results show that the contribution of the Breit interaction, self-energy, and vacuum polarization increase rapidly with increasing nuclear charge for certain configurations. The present calculated values are in good agreement with previous theoretical and experimental results, with errors better than 0.3%. AV / AL comparisons demonstrate the reliability of the data.

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Section: Introductionmentioning

confidence: 99%

Relativistic configuration-interaction calculations on K_α X-ray satellites of medium-charge Be-like ions

et al. 2024

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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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“…Many lines involving the ⩾ n 3 levels have been observed in both astrophysical and laboratory plasmas. Some of these have a diagnostic potential (Bhatia & Landi 2007a;, 2009a, 2009b. The ⩾ n 3 levels may also alter the simulated line intensities of n = 2-2 transitions through radiative cascades, which have been widely used for density and temperature diagnostics (Doron et al 2002).…”

Section: Introductionmentioning

confidence: 99%

“…Some calculations were performed for selected individual ions (Kramida & Träbert 1995;Tully & Chidichimo 2001Chidichimo et al 2003;Aggarwal et al 2005;Chidichimo et al 2005;Landi & Gu 2006;Savukov & Markhotok 2006;Bhatia & Landi 2007a, 2007bGu 2007;Duan et al 2008;Del Zanna et al 2008;, 2009a, 2009bHudson 2009;Mania et al 2009;Aggarwal & Keenan 2014). However, a majority of these calculations are at the level of a relatively simple configuration interaction method, which implies a relatively lower accuracy.…”

Section: Introductionmentioning

confidence: 99%

SYSTEMATIC CALCULATIONS OF ENERGY LEVELS AND TRANSITION RATES OF BE-LIKE IONS WITH Z = 10–30 USING A COMBINED CONFIGURATION INTERACTION AND MANY-BODY PERTURBATION THEORY APPROACH

Wang

Guo

Liu

et al. 2015

ApJS

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We report calculations of energy levels and radiative rates for transitions among the lowest 116 fine-structure levels arising from the ⩽ n 5 configurations in Be-like ions with Z = 10-30. The wavelengths, oscillator strengths, line strengths, and radiative rates for all possible electric dipole, magnetic dipole, electric quadrupole, and magnetic quadrupole transitions among the 116 levels have been calculated using the combined configuration interaction and many-body perturbation method. The accuracy of the results is determined through extensive comparisons with existing laboratory measurements and theoretical results. The present complete set of results should be of great help in line identification and the interpretation of spectra, as well as in the modeling and diagnostics of astrophysical and fusion plasmas.

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Atomic data and spectral line intensities for Ni XXV

Cited by 7 publications

References 96 publications

Relativistic configuration-interaction calculations on K_α X-ray satellites of medium-charge Be-like ions

Relativistic configuration-interaction calculations on K_α X-ray satellites of medium-charge Be-like ions

Atomic data and spectral line intensities for Ni XVII

SYSTEMATIC CALCULATIONS OF ENERGY LEVELS AND TRANSITION RATES OF BE-LIKE IONS WITH Z = 10–30 USING A COMBINED CONFIGURATION INTERACTION AND MANY-BODY PERTURBATION THEORY APPROACH

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Atomic data and spectral line intensities for Ni XXV

Cited by 7 publications

References 96 publications

Relativistic configuration-interaction calculations on K α X-ray satellites of medium-charge Be-like ions

Relativistic configuration-interaction calculations on K α X-ray satellites of medium-charge Be-like ions

Atomic data and spectral line intensities for Ni XVII

SYSTEMATIC CALCULATIONS OF ENERGY LEVELS AND TRANSITION RATES OF BE-LIKE IONS WITH Z = 10–30 USING A COMBINED CONFIGURATION INTERACTION AND MANY-BODY PERTURBATION THEORY APPROACH

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Relativistic configuration-interaction calculations on K_α X-ray satellites of medium-charge Be-like ions

Relativistic configuration-interaction calculations on K_α X-ray satellites of medium-charge Be-like ions