J. Phys. IV France 01 (1991) C1-23-C1-31
A PERTURBATIONAL APPROACH TO OBTAIN HIGH ACCURACY WAVELENGTH, APPLIED TO THE SUPERSTRUCTURE CODEP. LAUTARD1, P. FAUCHER1 and J. DUBAU2
1 Observatoire de la Côte d'Azur, BP. 139, F-06003 Nice Cedex, France
2 Observatoire de Meudon, F-92195 Meudon Principal Cedex, France
A perturbational method for improving calculated energy levels of atomic elements (Z ≤ 30) at different ionization stages is presented. The method uses as a starting point the SUPERSTRUCTURE code developed at the University College London and uses scaled Thomas-Fermi potentials. The perturbation theory is applied up to the second order energy correction and introduces the contribution of the complete basis, including continuum states of the unperturbed hamiltonian. As an illustration the method is applied to the determination of some energy terms of the He-like oxygen ion.
© EDP Sciences 1991