Electron impact excitation rate coefficients for Ni-like gadolinium

Shen, T. M.; Chen, C.-Y.; Wang, Y.-S.; Zou, Yaming

doi:10.1140/epjd/e2009-00100-3

Cited by 11 publications

(3 citation statements)

References 22 publications

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“…There have also been a few IPIRDW calculations for highly charged M-shell ions. In our recent works for Ni-like W and Gd ions [17,18], the IPIRDW results agreed well with the R-matrix values [19,20] if the same target expansions were used. In the cases of Mg-like ions, some large differences between resonances calculated using the IPIRDW approximation and R-matrix approach were discovered [21].…”

Section: Introductionsupporting

confidence: 78%

“…Collision strengths for all transitions among the 41 levels have been calculated at seven scattered electron energies E f = 3, 15, 92, RE contributions to total EIE rate coefficients are included using the IPIRDW approximation. More details could be found in our recent works for H-like Fe XXVI [13], Ne-like Se XXV [16] and Ni-like ions [17,18,29,30]. Here the relevant S-like resonance configurations 3s 2 3p 3 n l , 3s3p 4 n l and 3s 2 3p 2 3dn l with l 8 are included explicitly up to n = 50 .…”

Section: Calculation Proceduresmentioning

confidence: 99%

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Electron impact excitation for P-like Ni XIV

Wang

Chen

Huang

et al. 2010

J. Phys. B: At. Mol. Opt. Phys.

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In this paper we report the calculations on effective collision strengths for electron impact excitations among the 41 levels of 3s 2 3p 3 , 3s3p 4 and 3s 2 3p 2 3d configurations in Ni XIV. The Dirac R-matrix theory and the relativistic distorted-wave method in conjunction with isolated resonance approximation are adopted for the calculations. Detailed comparisons between the results obtained from the above two methods show that the independent process and isolated resonance approximation using distorted waves can describe the near threshold resonances reasonably well for most transitions in Ni XIV, though channel-coupling effects are found to be important for weak transitions. Resonances enlarge significantly the effective collision strengths for many transitions, even by over two orders of magnitude.

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Section: Introductionsupporting

confidence: 78%

Section: Calculation Proceduresmentioning

confidence: 99%

Electron impact excitation for P-like Ni XIV

Wang

Chen

Huang

et al. 2010

J. Phys. B: At. Mol. Opt. Phys.

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show abstract

“…The RE contributions are considered via the IPIRDW approach. For more details of the IPIRDW approach, our recent works on H-like Fe XXVI, [30] Ne-like Se XXV, [31] and Ni-like ions [32][33][34][35] are preferred. Here the related S-like doubly excited levels from 3s 2 3p 3 n l , 3s3p 4 n l , and 3s 2 3p 2 3dn l with l ≤ 8 are explicitly included up to n = 75, and higher n contributions up to n = 200 are included via the (n ) −3 scaling law.…”

Section: Calculationsmentioning

confidence: 99%

Resonance enhanced electron impact excitation for P-like Cu XV

Yan

et al. 2015

Chinese Phys. B

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Employing both the Dirac R-matrix and the relativistic distorted wave with independent process and isolated resonance approaches, we report resonance enhanced electron impact excitation data (specifically, effective collision strengths) among the lowest 41 levels from the n = 3 configurations of Cu XV. The results show that the latter approach can obtain resonance contributions reasonably well for most excitations of Cu XV, though a comparison between the two approaches shows that the close-coupling effects are truly significant for rather weak excitations, especially for two-electron excitations from the 3s3p4 to 3s23p23d configuration. Resonance contributions are significant (more than two orders of magnitude) for many excitations and dramatically influence the line intensity ratios associated with density diagnostics.

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