Eur. Phys. J. D 44, 51-56 (2007)
https://doi.org/10.1140/epjd/e2007-00172-y

The excitation energies, ionization potentials and oscillator strengths of neutral and ionized species of Uub (Z = 112) and the homologue elements Zn, Cd and Hg

¹ College of Physics and Electronic Engineering, Northwest Normal University, 730070, Lanzhou, P.R. China
² National Laboratory of Heavy Ion Accelerator of Lanzhou, 730000, Lanzhou, P.R. China
³ Institut für Physik, Universität Kassel, 34132 Kassel, Germany

Corresponding author: ^a dongcz@nwnu.edu.cn

Received: 14 March 2007
Published online: 26 May 2007

Abstract

Multi-configuration Dirac-Fock method (MCDF) is employed to calculate excitation energies, ionization potentials and oscillator strengths for all neutral and up to 5 times ionized species of element Uub, as well as the homologue elements Zn, Cd and Hg. On the basis of not too extended MCDF calculations, we studied some peculiar properties of element Uub resulting from its stronger relativistic and electron correlation effects. Using an extrapolative scheme, improved ionization potentials of Uub were obtained with an uncertainty of less than 0.5 eV. Furthermore, we calculated the low-lying resonance excitation energies, absorption oscillator strengths and the first ionization potential for Hg and Uub using large scale MCDF calculations, which improved the uncertainty of the excitation energies to less than 0.25 eV for element Hg. We hope that such calculations yield good results for element Uub.