Multi-configuration Diract-Hartree-Fock Adjusted Energy-consistent Pseudopotential for Uranium: Spin-orbit Configuration Interaction and Fock-Space Coupled-Cluster Study of U4+ and U5+ - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Journal of Physical Chemistry A Année : 2009

Multi-configuration Diract-Hartree-Fock Adjusted Energy-consistent Pseudopotential for Uranium: Spin-orbit Configuration Interaction and Fock-Space Coupled-Cluster Study of U4+ and U5+

Résumé

In order to assess the accuracy of a recently adjusted relativistic energy-consistent small-core pseudopotential for uranium, the U5+ (5f1 subconfiguration) spin-orbit splitting as well as the fine structure of the U4+ (5f2 subconfiguration) spectrum have been calculated. The pseudopotential has been adjusted to four-component all-electron data, i.e., at the multiconfiguration Dirac-Hartree-Fock level using the Dirac-Coulomb Hamiltonian with a Fermi nucleus charge distribution and perturbatively including the Breit interaction. Its performance in a dressed effective Hamiltonian spin-orbit configuration interaction framework is compared to that of an older scalar-relativistic Wood−Boring adjusted pseudopotential, supplemented by a valence spin-orbit term, as well as to all-electron calculations using the Douglas-Kroll-Hess Hamiltonian. Electron correlation is accounted for by the multireference configuration interaction method with and without the Davidson correction and with different frozen-orbital spaces. Our best calculations show satisfactory agreement with experimental data; i.e., the mean absolute (relative) deviations amount to 183 (2.4%) and 948 cm-1 (5.1%) for the U5+ and the U4+ fine-structure energy levels, respectively. Even better agreement, comparable to the one for rigorous highly correlated four-component all-electron data, is obtained in intermediate Hamiltonian Fock-space coupled-cluster calculations applying the new pseudopotential.
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hal-00410183 , version 1 (18-08-2009)

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Anna Weigand, Xiaoyan Cao, Valérie Vallet, Jean-Pierre Flament, Michael Dolg. Multi-configuration Diract-Hartree-Fock Adjusted Energy-consistent Pseudopotential for Uranium: Spin-orbit Configuration Interaction and Fock-Space Coupled-Cluster Study of U4+ and U5+. Journal of Physical Chemistry A, 2009, 113, pp.11509-11516. ⟨10.1021/jp902693b⟩. ⟨hal-00410183⟩
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