Collision strengths and oscillator strengths for excitation to the n = 3 and 4 levels of neon-like ions

Zhang, Honglin; Sampson, Douglas H.; Clark, R. E. H.; Mann, Joseph B.

doi:10.1016/0092-640x(87)90003-9

Cited by 99 publications

(51 citation statements)

References 17 publications

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“…For Ar 8+ , our AS agreement is within 20% when compared with that of Zhang et al (1987) for 70% of their transitions. The percentage of all-type transition increases up to 78% with |1.0 − g f V /g f L | ≤ 20% for this ion.…”

Section: Notessupporting

confidence: 59%

“…For Ca 10+ , there are about 76% of transitions with a g f difference within 20% when compared with the data of Zhang et al (1987). The difference of the present AS g f -values between the velocity and length gauges is also within 20% for 78% of alltype transitions.…”

Section: Notesmentioning

confidence: 55%

“…Index number corresponds to that in Table 4. (a) Data in CHIANTI are from the work of Zhang et al (1987) and Hibbert et al (1993 Rice et al (2000) and Zhang et al (1987), see Table 13. The ratio between the present AS g f in length and velocity gauges is within 20% of unity for 72% of all-type transitions.…”

Section: Notesmentioning

confidence: 99%

“…Index number corresponds to that in Table 6. (a) Data in CHIANTI from the work of Zhang et al (1987) and Hibbert et al (1993). (b) Data is calculated with multiconfiguration HartreeFock (MCHF) or multiconfiguration Dirac-Fock (MCDF) method, and available from the website: http://atoms.vuse.vanderbilt.edu/ (c) x y denotes x × 10 y .…”

Section: Comparison With Previous Calculationsmentioning

confidence: 99%

“…This confirms again that accurate atomic data is essential for the reliable diagnostic modelling of astrophysical and laboratory plasmas. However, most excitation data in this iso-electronic sequence are from the DW approximation (Zhang et al 1987;Bhatia et al 1985 Due to the advantage of high accuracy -see Griffin et al (1998), Badnell & Griffin (1999), Berrington et al (2005) and Liang et al (2008) -and computational efficiency of the intermediate-coupling frame transformation (ICFT) Rmatrix methodology and associated codes, along with the high capability of parallel computer clusters, it is now feasible to provide excitation data for iso-electronic sequences across the entire range of astrophysical interest within the R-matrix framework. Witthoeft et al (2007) investigated the physics of electronimpact excitation along the F-like iso-electronic sequence (Ne + to Kr 27+ ) and Liang et al (2009a,b) also did an entire sequence calculation for Na-like ions (for both outer-and inner-shell excitations) with Auger-and radiative-damping included for the inner-shell excitations.…”

Section: Introductionmentioning

confidence: 99%

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

Liang

Badnell²

2010

A&A

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We present results for the electron-impact excitation of all Ne-like ions from Na + to Kr 26+ obtained using the intermediate-coupling frame transformation R-matrix approach. For each ion's calculation, the close-coupling expansion is taken to be the 113 LS terms (209 levels) belonging to the configurations [1s 2 ]2s 2 2p 6 , 2s 2 2p 5 {3, 4, 5}l, 2s2p 6 {3, 4, 5}l (l ∈ s, p, d, f, and g), and 2s 2 2p 5 {6, 7}l (l ∈ s, p, and d). An additional configuration interaction effect arising from configurations of 2s 2 2p 4 3l{3, 4, 5}l (l ∈ s, p, d, f and g) was included in the target expansion. A detailed comparison of the target structure has been made for six specific ions (Si 4+ , Ar 8+ , Ca 10+ , Fe 16+ , Ni 18+ , and Kr 26+ ) spanning the sequence to assess the accuracy for the entire sequence. Effective collision strengths (Υs) are presented at temperatures ranging from 2×10 2 (q+1) 2 K to 2×10 6 (q+1) 2 K (where q is the residual charge of ions, i.e. Z −10). Detailed comparisons for the Υs are made with the results of previous calculations for several ions, which span the sequence. Furthermore, we examine the iso-electronic trends of effective collision strengths as a function of temperature. The present results are the only R-matrix ones for the majority of the ions and the most extensive and complete data for modelling to-date.

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Section: Notessupporting

confidence: 59%

Section: Notesmentioning

confidence: 55%

Section: Notesmentioning

confidence: 99%

Section: Comparison With Previous Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

Liang

Badnell²

2010

A&A

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Consistent QED approach to calculation of electron‐collision excitation cross sections and strengths: Ne‐like ions

Глушков

Амбросов

Loboda

et al. 2005

Int J of Quantum Chemistry

107

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ABSTRACT:We present the uniform energy approach, formally based on the quantum electrodynamics, using the gauge invariant scheme of generation of the optimal one-electron representation, for the calculation of electron-collision strengths and cross sections. The aim is to study, in a uniform manner, elementary processes responsible for emission-line formation in plasmas. The electron-collision excitation cross sections and strengths for some Ne-like ions (Fe, Ba) are calculated. To test the results of calculations, we compare them with the calculations of other investigators and with the available experimental data.

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Generalized energy approach for calculating electron collision cross‐sections for multicharged ions in a plasma: Debye shielding model

Malinovskaya

Глушков

Khetselius

et al. 2010

Int J of Quantum Chemistry

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A uniform quantum energy approach for studying spectra of the multicharged ions in a plasmas and the electron-ion collision cross sections is presented. The approach is based on formally exact QED theory by using the relativistic Dirac Hamiltonian for electron-nuclear and electron-electron potentials, the gauge invariant scheme of generation for the optimal one-quasiparticle representation and the Debye shielding model. The measured and calculated electron-collisional excitation cross sections for Ne-like barium ion for different values of the incident electron energy are presented and analyzed.

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Collision strengths and oscillator strengths for excitation to the n = 3 and 4 levels of neon-like ions

Cited by 99 publications

References 17 publications

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

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

Consistent QED approach to calculation of electron‐collision excitation cross sections and strengths: Ne‐like ions

Generalized energy approach for calculating electron collision cross‐sections for multicharged ions in a plasma: Debye shielding model

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