Theoretical studies of the structures and vibrational frequencies of actinide compounds using relativistic effective core potentials with Hartree{endash}Fock and density functional methods: UF{sub 6}, NpF{sub 6}, and PuF{sub 6}
- Theoretical Division and Seaborg Institute for Transactinium Science, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)
The calculated bond lengths and vibrational frequencies of the octahedral compounds UF{sub 6}, NpF{sub 6}, and PuF{sub 6} from Hartree{endash}Fock and various density functional calculations are compared. The calculations employ relativistic effective core potentials (RECPs) derived from one-component relativistic Hartree{endash}Fock atomic wave functions. The structures and frequencies of the hexafluoride molecules were obtained using analytic gradient and second derivative techniques. Of the methods examined here the local density (SVWN) and hybrid functional (B3LYP) have the best performance in terms of the errors compared to experiment for the bond lengths and vibrational frequencies. The analytic representations of the RECPs for U, Np, and Pu are given along with Gaussian basis sets for the valence electrons of these actinide elements. {copyright} {ital 1998 American Institute of Physics.}
- OSTI ID:
- 641511
- Journal Information:
- Journal of Chemical Physics, Journal Name: Journal of Chemical Physics Journal Issue: 10 Vol. 109; ISSN JCPSA6; ISSN 0021-9606
- Country of Publication:
- United States
- Language:
- English
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