Valence basis sets for relativistic energy-consistent small-core actinide pseudopotentials

Gaussian (14s13p10d8f6g)/[6s6p5d4f3g] atomic natural orbital valence basis sets have been generated for relativistic energy-consistent small-core actinide pseudopotentials of the Stuttgart–Bonn variety. Effective valence spin–orbit operators supplementing the scalar-relativistic pseudopotentials have been derived from multiconfiguration Dirac–Hartree–Fock reference data. Pseudopotentials, basis sets and spin–orbit operators have been used to determine the first and second ionization potentials of all actinide elements at the multiconfiguration self-consistent field and multireference averaged coupled-pair functional level. Comparison is made to results obtained from large-scale calculations using uncontracted…