Radiative properties of the W5+ ion

Adjustment of the average Energies and spin-orbits parameters

The radiative properties of the W5+ ion is used in the survey of two theoretical independent approaches, i.e. the method Hartree-Fock with relativistic corrections executed by the Cowan code and the multiconfigurationnelmethod of Dirac-Hartree-Fock (MCDF) executed in the GRASP2K set. The interrelationships (interactions) valence heart is studied in detail while comparing the models of the potential of core-polarization more a correction of the operator of the dipole considered (HFR + CPOL) in a case and on the configurations core-excited are included explicitly in the valance interaction configuration of the expansion of the atomic state function (Migdalek[5] showed that the interaction corresponds to the interaction of configuration). In general, a good agreement is found between these two theoretical methods. Remarkably, the core-polarizationeffects lengthen the life spans of 15% until 35% and even by a factor of 2 for the levels 5f. The lifetimes of these two 5flevels are instituted to be a dependent and in particular sensitive model, excluding the core-penetration effects, clearly requiring for it of the precise measures.

·         Calculations

Tungsten is a heavy element of the periodic picture with z=74. The level fundamental of the W VI is  with electron of valence revolving around an erbium-like of the ionic core of its 68 electrons. Therefore, it is important to consider the effects at a time relativistic and of interrelationship to describe this atomic structure correctly. As no measurements are available in the literature, two independent theoretical methods that take in consideration the two the effects have been used in this survey to calculate and to basis the radiative parameters. These are described briefly in the following subdivisions.  

·         Method Hartree-Fock with the relativistic corrections

In the Hartree-Fock method with the relativistic corrections (HFR) of Cowan (1981), a whole of orbital is gotten for every electronic configuration while solving the Hartree-Fock equations spherically for an averaged atom. The equations result from the variational principle application to the configuration average energy. The relativistic corrections are included in this set of equations, i.e. the Blume-Watson spin-orbits , mass-velocity and of a part calls Darwin terms. The Blume-Watson spin-orbit term consists of the part of theBreit interaction can be reduced to an uniform operator [25, 26]. The multiconfiguration Hamiltonian matrix is constructed and diagonalized in the LSJM_j∏representation in the structure of the theory of Slater-Condo.