ENERGY-ADJUSTED PSEUDOPOTENTIALS FOR THE ACTINIDES - PARAMETER SETS AND TEST CALCULATIONS FOR THORIUM AND THORIUM MONOXIDE

We present nonrelativistic and quasirelativistic energy-adjusted pseud opotentials, the latter augmented by spin-orbit operators, as well as optimized (12s11p10d8f)/[8s7p6d4f]-Gaussian-type orbitals (GTO) valenc e basis sets for the actinide elements actinium through lawrencium. At omic excitation and ionization energies obtained by the use of these p seudopotentials and basis sets in self-consistent field (SCF) calculat ions differ by less than 0.2 eV from corresponding, finite-difference all-electron results. Large-scale multiconfiguration self-consistent f ield (MCSCF), multireference configuration Interaction (MRCI), and mul tireference averaged coupled-pair functional (MRACPF) calculations for -thorium and thorium monoxide yield results in satisfactory agreement with available experimental data. Preliminary results from spinorbit c onfiguration interaction,calculations for the low-lying electronic-sta tes of thorium monoxide are also reported.