Abstract
Universal basis sets from all-electron calculations can be adapted to be used along with pseudopotentials by the generator coordinate method (GCM). Calculations carriedout with Hay and Wadt or Steven, Bash and Krauss pseudopontentials along with a universal basis set are in agreement with all-electron calculations and also with improved basis sets specially developed to be used with pseudopotential. The support provided by GCM allows a simple procedure to enlarge or reduce the size of the universal basis set as well as a systematic procedure to include polarization functions.
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