Title: Theoretical study of actinide monocarbides (ThC, UC, PuC, AmC)
Authors: POGANY PeterKOVACS ATTILAVISSCHER LucasKONINGS Rudy
Citation: JOURNAL OF CHEMICAL PHYSICS vol. 145 no. 24 p. 244310
Publisher: AMER INST PHYSICS
Publication Year: 2016
JRC N°: JRC102256
ISSN: 0021-9606
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC102256
DOI: 10.1063/1.4972812
Type: Articles in periodicals and books
Abstract: A study of four representative actinide monocarbides, ThC, UC, PuC, and AmC, has been performed with relativistic quantum chemical calculations. The two applied methods were multireference complete active space second-order perturbation theory (CASPT2) including the Douglas-Kroll-Hess Hamiltonian with all-electron basis sets and density functional theory with the B3LYP exchange-correlation functional in conjunction with relativistic pseudopotentials. Beside the ground electronic states, the excited states up to 17 000 cm−1 have been determined. The molecular properties explored included the ground-state geometries, bonding properties, and the electronic absorption spectra. According to the occupation of the bonding orbitals, the calculated electronic states were classified into three groups, each leading to a characteristic bond distance range for the equilibrium geometry. The ground states of ThC, UC, and PuC have two doubly occupied π orbitals resulting in short bond distances between 1.8 and 2.0 Å, whereas the ground state of AmC has significant occupation of the antibonding orbitals, causing a bond distance of 2.15 Å.
JRC Directorate:Nuclear Safety and Security

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