Comparison of relativistic effective core potential and all-electron Dirac-Coulomb calculations of mercury transition energies by the relativistic coupled-cluster method

N. S. Mosyagin, E. Eliav, A. V. Titov, U. Kaldor

Research output: Contribution to journalArticlepeer-review

Abstract

Relativistic effective core potential (RECP) and all-electron Dirac-Coulomb calculations of transition energies for low-lying states of the mercury atom and its ions are carried out with equivalent basis sets by the relativistic coupled-cluster method. RECP results are compared with corresponding all-electron values to estimate the accuracy of different RECP versions. Contributions from correlations of different electron shells to the calculated transition energies are studied. Effects of different nuclear models and of basis set truncation of different orbital angular momenta as well as errors of the Gaussian approximation of the generalized RECP components are reported. We show that at least 34 external electrons of the mercury atom should be correlated and the one-electron basis set should contain up to h-type functions in order to attain consistent agreement within 200 cm-1 with experimental data.

Original languageEnglish
Pages (from-to)667-676
Number of pages10
JournalJournal of Physics B: Atomic, Molecular and Optical Physics
Volume33
Issue number4
DOIs
StatePublished - 28 Feb 2000

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