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The Computation of Energy Levels and Oscillator Strengths of Fe X to Fe XIII Involving the Adjustment of Parameters to Achieve Consistency with Observations

Published online by Cambridge University Press:  25 September 2017

B.C. Fawcett ,
G.E. Bromage  and
R.D. Cowan
B.C. Fawcett
Affiliation:
Appleton Laboratory, Astrophysics Research Division, Science Research Council, Culham Laboratory Abingdon, Oxon., United Kingdom
G.E. Bromage
Affiliation:
Appleton Laboratory, Astrophysics Research Division, Science Research Council, Culham Laboratory Abingdon, Oxon., United Kingdom
R.D. Cowan
Affiliation:
The University of California, Los Alamos Scientific Laboratory, New Mexico 87545, USA

Extract

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Energy levels and oscillator strengths are calculated for the 3s23pn–3s23pn–13d transition arrays of Fe X, Fe XI, Fe XII and Fe XIII. The Slater radial integrals for these computations are adjusted so as to become consistent with established energy levels. Pertinent configuration interactions are included and the interaction integrals are reduced by up to 35% from values calculated ab initio, to achieve consistency.

Initial theroretical calculations are made using the ab initio Hartree-X, Slater-Condon programme of Cowan (1967, 1968), the second of which now includes configuration interaction. The first programme computes values for the average energy of the configuration Eav, the electrostatic direct integrals Fk and exchange integrals Gk , the spin-orbit parameters ζ, and the configuration interaction integrals Rk. From these the second programme computes energy levels, wavelengths and oscillator strengths for the transition arrays concerned.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 43: Vth Conference on UV & X-Ray Spectroscopy of Astrophysical & Laboratory Plasmas , July 1977 , pp. 41 - 41a
Copyright
Copyright © Crown Research Institutes 1977

References

Bromage, G.E., Cowan, R.D., Fawcett, B.C. 1977 Physics Scripta (In the press).Google Scholar
Cowan, R.D. 1967. Phys.Rev., JH53, 54#x2013;61.Google Scholar
Cowan, R.D. 1968 J.Opt.Soc.Am. 58, 808-818 ibid 924–933.Google Scholar
Wybourne, B.G. 1965. Spectroscopic properties of rare earths, pp 39, 69 (Wiley, John, N.Y.).Google Scholar