par Yoca, S.Enzonga;Palmeri, Patrick;Quinet, Pascal;Jumet, Guillaume 
;Biémont, Emile
Référence Journal of Physics. B, Atomic Molecular and Optical Physics, 45, page (035002)
Publication Publié, 2012
;Biémont, EmileRéférence Journal of Physics. B, Atomic Molecular and Optical Physics, 45, page (035002)
Publication Publié, 2012
Article révisé par les pairs
| Résumé : | The radiative properties of the W 5 + ion are investigated using two independent theoretical approaches, i.e. the HartreeFock method with relativistic corrections of Cowan and the multiconfiguration DiracHartreeFock method as implemented in the grasp2k package. The corevalence correlations are studied in detail comparing models where a core-polarization model potential plus a correction to the dipole operator are considered (HFR + CPOL) on the one hand, and core-excited configurations are explicitly included in the configuration-interaction expansion of the atomic state function on the other hand. In general, a good agreement is found between the two theoretical methods. Core-polarization effects are remarkably strong lengthening the lifetimes up to 15%35% and even by a factor of 2 for the 5f levels. The lifetimes of the two 5f levels are found to be model dependent and particularly sensitive to core-penetration effects; precise measurements are clearly needed here. © 2012 IOP Publishing Ltd. |
