Generalization of the concepts of seniority number and ionicity
Résumé
We present generalized versions of the concepts of seniority number and
ionicity. These generalized numbers count respectively the partially occupied and
fully occupied shells for any partition of the orbital space into shells. The Hermitian
operators whose eigenspaces correspond to wave functions of definite generalized
seniority or ionicity values are introduced. The generalized seniority numbers afford
to establish refined hierarchies of configuration interaction spaces within those of
fixed ordinary seniority. Such a hierarchy is illustrated on the buckminsterfullerene
C 60 molecule.
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