Atomic parameters of Hf XLVIII, Ta XLIX, Os LII, Pt LIV, and Au LV

Abstract

Ab initio multiconfiguration Dirac-Fock calculations are performed for energy levels and lifetimes of the lowest 115 fine-structure levels generated from the 3s<sup>2</sup>3p<sup>6</sup>3d<sup>7</sup>, 3s<sup>2</sup>3p<sup>5</sup>3d<sup>8</sup>, 3s3p<sup>6</sup>3d<sup>8</sup>, 3s<sup>2</sup>3p<sup>4</sup>3d<sup>9</sup>, and 3s3p<sup>5</sup>3d<sup>9</sup> configurations of Hf XLVIII, Ta XLIX, Os LII, Pt LIV, and Au LV of fusion interest. Furthermore, radiative rates are calculated for all electric dipole, electric quadrupole, magnetic dipole, and magnetic quadrupole transitions. Electron correlation is treated through multiconfiguration expansions in the active space approximation. The Breit interaction and the leading quantum electrodynamic corrections, in the form of self-energy and vacuum polarization, are included. Another theoretical attempt, based on the Flexible Atomic Code is presented for the atomic structure to serve as an independent check of the MCDF values and the results show fairly good agreement with the MCDF ones. Comparisons are made with available results in the literature. The uncertainties of our energies and strong transition rates are found to be approximately 0.25% and 2%, respectively. The extended and consistent data presented in this study should be of notable interest in various fusion research.