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CASINO pseudopotential library

Description of Gaussian fits

The method of fitting the pseudopotentials to a Gaussian basis set is described in Ref. 1. Fits are reported in formats suitable for the CRYSTAL and GAUSSIAN codes, and for the GAMESS code. It is important to realise that the CRYSTAL and GAUSSIAN fits are identical, and only the format of the files differs. Unfortunately not all quantum chemistry codes can deal with the large powers of r used to multiply the Gaussian functions. GAMESS is one of the codes which does not currently support all of the powers we would like to use and we have had to fit the pseudopotentials with a more restricted basis set for use in GAMESS. This leads to some loss of quality and the CRYSTAL/GAUSSIAN fits should be used whenever possible.

Spin orbit potentials are also provided, in the standard Gaussian parameterization.

For some of the atoms parameters for core polarization potentials are also listed, from
"Many-body core-valence partitioning" E.L. Shirley and R.M. Martin, Phys. Rev. B 47, 15413 (1993).



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