Abstract
Non-additive interactions in homonuclear trimers composed of Ar, Kr and Xe atoms have been examined using the model potential SCF (MP) method of Huzinaga and co-workers. During optimization of the atomic valence pseudo-orbitals and MP parameters great emphasis has been put on maintaining a reliable description of the long-range valence electron distribution. For Ar 3 very accurate all electron SCF calculations have also been performed. The present MP values compared excellently with the all electron energies. For Xe 3 relativistic effects have been estimated within MP quasi-relativistic approach.
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