Abstract
We discuss a modular and efficient FORTRAN program which operating on a given linear combination of Slater determinants generates a spin eigenfunction by means of a symmetric, idempotent and hermtitian projection operator. In combination with other modules described in two previous and three further papers it may be used to generate all symmetry eigenfunctions needed in atomic and molecular electronic structure calculations. In particular, first-order and second-order interacting spaces are discussed.
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