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Using one-range addition theorems for noninteger n Slater type orbitals andCoulomb-Yukawa like correlated interaction potentials with noninteger indicesobtained by the author with the help of complete orthonormal sets ofexponential type orbitals, the series of expansion formulas are established forthe potential produced by molecule, and the potential energy of interactionbetween molecules through the radius vectors of nuclei of molecules, and thelinear combination coefficients of molecular orbitals. The formulae obtainedare useful especially for the study of interaction between atomic-molecularsystems containing any number of closed and open shells when theHartree-Fock-Roothaan and explicitly correlated methods are employed. Therelationships obtained are valid for the arbitrary values of indices andscreening constants of orbitals and correlated interaction potentials.

Evaluation of potential energy of interaction between molecules using  one-range addition theorems for Slater type orbitals and Coulomb-Yukawa like  correlated interaction potentials