ISSN 1017-2548(Print)
ISSN 2234-8530(Online)
Volume 22, Number 3
JKCSEZ 22(3)
June 20, 1978 

Slater type orbitals, located at two different points A and B, are expressed in a common coordinate system by expanding the spherical harmonics and the radial part of these orbitals in terms of the reference point A. Master formulas for two center overlap integrals are derived, using the general expansion formulas of slater type atomic orbitals. Two center overlap integrals for CH4, H2O, NH3, C2H6 and PH3 molecules are evaluated, using master formulas for two center overlap integrals. The results are in agreement with those of two center overlap integrals of Mulliken.