On the Viscosity and Physical Origin of Stability of Weakly Bound Complexes CdZn, HgZn and HgCd

Abstract

Supermolecular CCSD(T)ab initiocalculations of potential energy curves for the electronic ground states of heteronuclear van der Waals complexes formed from the atoms of IIB group are presented. The physical origin of stability of the studied structures was analyzed by the symmetry-adapted perturbation theory. The magnitude of dispersion term increases with the increase of diatomic mass, but the relative importance of dispersion vs Hartree- Fock induction energies decreases in the order CdZn > HgZn > HgCd. Theoretical calculations of the temperature dependence of the shear viscosity for low-density binary mixtures are in good agreement with the temperature dependences of the shear viscosity obtained from empirical formula.