Electronic structure of eka-thorium (element 122) compared with thorium

Ephraim Eliav*, Arie Landau, Yasuyuki Ishikawa, Uzi Kaldor

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


The electronic levels of thorium and eka-thorium (element 122) are calculated in the framework of the Dirac-Coulomb-Breit Hamiltonian using a large Gaussian-spinor basis. Correlation is included by the Fock-space or intermediate Hamiltonian coupled-cluster method. The 51 reported levels of thorium and its ions are compared with experiment, giving an average error of 0.062 V for Fock space and 0.051 V for the intermediate Hamiltonian method. Predicted E122 levels are expected to have similar accuracy. The ground state of E122 is 8s27d8p, to be contrasted with 7s26d2 for Th. Increased relativistic effects in the super-heavy element lead to major differences between the level structure of these two atoms and their ions. The effects of Breit and QED terms are discussed.

Original languageEnglish
Pages (from-to)1693-1700
Number of pages8
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Issue number7
StatePublished - 14 Apr 2002


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