This keyword requests that a model potential be substituted for the core electrons. The Cards option is by far its most used mode. Options Read Read pseudo-potential data from the input stream.
Input is described in the next subsection below.
Cards is a synonym for Read . CHF Requests the Coreless Hartree-Fock potentials. This option is normally used with the LP-31G basis sets. SHC Requests the SHC potentials. Requests the LANL1 potentials.