EXPRESSION FOR OVERLAP INTEGRALS OF SLATER ORBITALS

A method for computing the overlap integral of two Slater orbitals of arbitrary l and integer n greater-than-or-equal-to l on arbitrary cent ers is developed. The expressions permit the elimination in a simple w ay of the numerical difficulties that arise when nonlinear parameters are close together. The complexity of a calculation using the results is discussed and compared with other approaches. Numerical examples an d qualitative estimates are given to indicate the accuracy of the meth od.