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Relativistic correlating basis sets for actinide atoms from 90Th to 103Lr.

Authors
  • Noro, Takeshi
  • Sekiya, Masahiro
  • Osanai, You
  • Koga, Toshikatsu
  • Matsuyama, Hisashi
Type
Published Article
Journal
Journal of computational chemistry
Publication Date
Dec 01, 2007
Volume
28
Issue
16
Pages
2511–2516
Identifiers
PMID: 17508413
Source
Medline
License
Unknown

Abstract

For 14 actinide atoms from (90)Th to (103)Lr, contracted Gaussian-type function sets are developed for the description of correlations of the 5f, 6d, and 7s electrons. Basis sets for the 6d orbitals are also prepared, since the orbitals are important in molecular environments despite their vacancy in the ground state of some actinides. A segmented contraction scheme is employed for the compactness and efficiency. Contraction coefficients and exponents are so determined as to minimize the deviation from accurate natural orbitals of the lowest term arising from the 5f(n-1)6d(1)7s(2) configuration. The spin-free relativistic effects are considered through the third-order Douglas-Kroll approximation. To test the present correlating sets, all-electron calculations are performed on the ground state of (90)ThO molecule. The calculated spectroscopic constants are in excellent agreement with experimental values.

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