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Hartree, D.R. and Salpeter, E.E. (1957) Quantum Mechanics of One- and Two-electron Atoms. Springer-Verlage, Berlin, New York.

has been cited by the following article:

• TITLE: Energy Levels, Oscillator Strengths, and Transition Probabilities of Ni XIX and Cu XX

  AUTHORS: Wessameldin S. Abdelaziz, M. Atta Khedr, Mai E. Ahmed, Laila Gaabour, Tharwat El-Shirbini

  KEYWORDS: Energy Levels; Oscillator Strengths; Transition Probabilities

  JOURNAL NAME: Optics and Photonics Journal, Vol.4 No.3, March 27, 2014

  ABSTRACT: Energy levels, oscillator strengths, and transition probabilities, for the 1s2 2s2 2p6, 2p53l (l = 0, 1, 2), 2p54l (l = 0, 1, 2, 3) states in Ni XIX and Cu XX are calculated using COWAN code. The Correlation and relativistic effects are considered. The calculations are compared with other results in the literature. A good agreement is found. We also report on some unpublished energy values.