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Accession Number N20120012550
Title Atomic Data and Spectral Line Intensities for NI XVII.
Publication Date Feb 2011
Media Count 36p
Personal Author A. K. Bhatia E. Landi
Abstract Electron 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 feet, 3l4l0 inches, and 3s5l0 inches, with l, l foot = s,p,d, l inch = s,p,d, f, and l inch = 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(exp 8) - 10(exp 14)/cubic cm and at an electron temperature of logT(sub e)e(K) = 6.5, corresponding to the maximum abundance of Ni XVII. Spectral line intensities are calculated, and their diagnostic relevance is discussed.
Keywords Atoms
Data bases
Line spectra

Source Agency National Aeronautics and Space Administration
NTIS Subject Category 46 - Physics
Corporate Author Goddard Space Flight Center, Greenbelt, MD.
Document Type Journal article
Title Note N/A
NTIS Issue Number 1303
Contract Number NNH06CD24C NNG04ED07P

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