PMID- 26839966 OWN - NLM STAT- PubMed-not-MEDLINE DCOM- 20160720 LR - 20160308 IS - 1549-9626 (Electronic) IS - 1549-9618 (Linking) VI - 12 IP - 3 DP - 2016 Mar 8 TI - Improved Segmented All-Electron Relativistically Contracted Basis Sets for the Lanthanides. PG - 1148-56 LID - 10.1021/acs.jctc.5b01048 [doi] AB - Improved versions of the segmented all-electron relativistically contracted (SARC) basis sets for the lanthanides are presented. The second-generation SARC2 basis sets maintain efficient construction of their predecessors and their individual adaptation to the DKH2 and ZORA Hamiltonians, but feature exponents optimized with a completely new orbital shape fitting procedure and a slightly expanded f space that results in sizable improvement in CASSCF energies and in significantly more accurate prediction of spin-orbit coupling parameters. Additionally, an extended set of polarization/correlation functions is constructed that is appropriate for multireference correlated calculations and new auxiliary basis sets for use in resolution-of-identity (density-fitting) approximations in combination with both DFT and wave function based treatments. Thus, the SARC2 basis sets extend the applicability of the first-generation DFT-oriented basis sets to routine all-electron wave function-based treatments of lanthanide complexes. The new basis sets are benchmarked with respect to excitation energies, radial distribution functions, optimized geometries, orbital eigenvalues, ionization potentials, and spin-orbit coupling parameters of lanthanide systems and are shown to be suitable for the description of magnetic and spectroscopic properties using both DFT and multireference wave function-based methods. FAU - Aravena, Daniel AU - Aravena D AD - Max Planck Institut fur Chemische Energiekonversion , Stifstr. 34-36, 45470 Mulheim an der Ruhr, Germany. AD - Facultad de Quimica y Biologia, Universidad de Santiago de Chile (USACH) , Casilla 40, Correo 33, Santiago, Chile. FAU - Neese, Frank AU - Neese F AD - Max Planck Institut fur Chemische Energiekonversion , Stifstr. 34-36, 45470 Mulheim an der Ruhr, Germany. FAU - Pantazis, Dimitrios A AU - Pantazis DA AD - Max Planck Institut fur Chemische Energiekonversion , Stifstr. 34-36, 45470 Mulheim an der Ruhr, Germany. LA - eng PT - Journal Article DEP - 20160217 PL - United States TA - J Chem Theory Comput JT - Journal of chemical theory and computation JID - 101232704 EDAT- 2016/02/04 06:00 MHDA- 2016/02/04 06:01 CRDT- 2016/02/04 06:00 PHST- 2016/02/04 06:00 [entrez] PHST- 2016/02/04 06:00 [pubmed] PHST- 2016/02/04 06:01 [medline] AID - 10.1021/acs.jctc.5b01048 [doi] PST - ppublish SO - J Chem Theory Comput. 2016 Mar 8;12(3):1148-56. doi: 10.1021/acs.jctc.5b01048. Epub 2016 Feb 17.