Abstract
Auxiliary basis sets for use in density fitting second-order Møller-Plesset perturbation theory and other correlated ab initio methods have been developed for the 4d transition metal elements Y-Tc and Rh-Pd (sets for Ru, Ag, and Cd are already available), to be used in conjunction with the correlation consistent basis sets with pseudopotentials cc-pVnZ-PP and aug-cc-pVnZ-PP. Correlation energy calculations for a test set of small- to medium-sized transition metal complexes encompassing a variety of oxidation states show that the error in using these auxiliary basis sets is around 3-4 orders of magnitude smaller than the error due to orbital basis set size. The effect of truncating the auxiliary basis sets to remove higher angular momentum functions is also considered.
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