| Abstract: | The problem of calculating diatomic alkaline metal (homo- and heteronuclear) molecules KM (M=Li, Na, K, Rb, Cs) is treated in terms of a pseudopotential approach in the framework of a formally exact model perturbation theory of Rayleigh-Schrödinger type with a test zero-order potential. A Gell-Mann type local model potential is used as a zero-order potential. The results of calculations of energy parameters, in particular, dissociation energies, are given; some of them were obtained for the first time. The calculation demonstrated that two major effects of second-order perturbation theory: polarizing interaction of valence particles across the core and mutual screening of particles must be taken into account to achieve an acceptable accuracy of calculations. |
