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A: Atomphysik
A 21: Poster II
A 21.12: Poster
Donnerstag, 6. April 2000, 17:00–19:30, Aula
A new approach to calculate angular momentum coefficients in jj–coupling — •G. Gaigalas1 and S. Fritzsche2 — 1Institute of Theoretical Physics and Astronomy, Vilnius, Lithuania — 2Fachbereich Physik, Universität Kassel, 34132 Kassel
The accuracy of modern experiments challenges theorists in atomic structure to obtain and to match with experimental precision. For multielectron atoms and ions this can be achieved by using perturbation theory, the configuration interaction method or the multiconfiguration Hartree–Fock or Dirac–Fock methods. All of them need to integrate over spin–angular variables which often constitutes a considerable part of the computational effort. One of the most widely–used computational schemes is due to Fano [1] which does however not exploit the full power of Racah’s algebra. In order to accelerate atomic structure calculations for open–shell atoms and ions, we developed an approach [2] which is free of the previous shortcomings. A new program for computing angular momentum coefficients for jj–coupled configuration state functions will be presented.
[1] U. Fano, Phys. Rev. A 140 A67 (1965).
[2] G. Gaigalas, Z. Rudzikas and C. Froese Fischer, J. Phys. B: At. Mol. Phys. 30 3747 (1997).