Atomic data and spectral line intensities for Ni XXV

Journal Article · Wed Jul 15 04:00:00 EDT 2009 · Atomic Data and Nuclear Data Tables

DOI:https://doi.org/10.1016/j.adt.2009.03.001· OSTI ID:21274229

Landi, E ^[1]; Bhatia, A K ^[2]

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1. ARTEP, Inc., Columbia, MD 21044 (United States)
2. NASA/Goddard Space Flight Center, Greenbelt, MD 20771 (United States)

Electron impact collision strengths, energy levels, oscillator strengths, and spontaneous radiative decay rates are calculated for Ni XXV. The configurations used are 2s{sup 2},2s2p,2p{sup 2},2l3l{sup '},2l4l{sup '}, and 2s5l{sup '}, with l=s,p and l{sup '}=s,p,andd giving rise to 92 fine-structure levels in intermediate coupling. Collision strengths are calculated at seven incident energies (50, 100, 150, 225, 300, 375, and 450 Ry) for the transitions within the three lowest configurations corresponding to the 10 lowest energy levels, and at five incident energies (150, 225, 300, 375, and 450 Ry) for transitions between the lowest five levels and the n=3,4,and5 configurations. The calculations are carried out using the distorted wave approximation. 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 10{sup 8}-10{sup 14}cm{sup -3} range at an electron temperature of logT{sub e}(K)=7.3, corresponding to the maximum abundance of Ni XXV. 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.

• OSTI ID: 21274229
• Journal Information: Atomic Data and Nuclear Data Tables, Journal Name: Atomic Data and Nuclear Data Tables Journal Issue: 4 Vol. 95; ISSN ADNDAT; ISSN 0092-640X
• Country of Publication: United States
• Language: English

Related Subjects

74 ATOMIC AND MOLECULAR PHYSICS
ABUNDANCE
APPROXIMATIONS
DISTORTED WAVE THEORY
ELECTRON COLLISIONS
ELECTRON DENSITY
ELECTRON TEMPERATURE
ELECTRONS
ENERGY LEVELS
EQUATIONS
EXCITATION
FINE STRUCTURE
INTERMEDIATE COUPLING
NICKEL
OSCILLATOR STRENGTHS
RADIATIVE DECAY