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Atomic data and spectral line intensities for Ni XXI

✍ Scribed by A.K. Bhatia; E. Landi; H.E. Mason

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
334 KB
Volume
83
Category
Article
ISSN
0092-640X

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✦ Synopsis

Electron impact collision strengths, energy levels, oscillator strengths and spontaneous radiative decay rates are calculated for Ni XXI. The configurations used are 2s 2 2p 4 , 2s2p 5 , 2p 6 , 2s 2 2p 3 3s, and 2s 2 3p 3 3d giving rise to 58 fine-structure levels in intermediate coupling. Collision strengths are calculated at five incident energies, 85, 170, 255, 340, and 425 Ry. Excitation rate coefficients are calculated by assuming a Maxwellian electron velocity distribution at an electron temperature of log T e Γ°KÞ ΒΌ 6:9, corresponding to maximum abundance of Ni XXI. Using the excitation rate coefficients and the radiative transition rates, statistical equilibrium equations for level populations are solved at electron densities 10 8 -10 14 cm Γ€3 . Relative spectral line intensities are calculated. Proton excitation rates between the lowest three levels have been included in the statistical equilibrium equations. The predicted intensity ratios are compared with available observations.

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