CALCULATION OF ALKALINE METAL DIMERS IN TERMS OF MODEL PERTURBATION-THEORY

The problem of calculating diatomic alkaline metal (homo- and heteronu clear) molecules MM (M = Li Na, K, Rb, Cs) is treated in terms of a ps eudopotential approach in the framework of a formally exact model pert urbation theory of Rayleigh-Schrodinger type with a test zero-order po tential. A Gell-Mann type local model potential is used as a zero-orde r potential. The results of calculations of energy parameters, in part icular, dissociation energies, are given; some of them were obtained f or the first time. The calculation demonstrated that two major effects of second-order perturbation theory: polarizing interaction of valenc e particles across the core and mutual screening of particles must be taken into account to achieve an acceptable accuracy of calculations.