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In the quantum theory of intermoleeular forces, emphasis usually falls on long-range effects such as the dispersion interactions. At shorter range the electron distributions begin to overlap appreciably, serious non-orthogonality problems arise, and the nature of the interactions is less well understood. This paper is devoted to a general analysis of the short-range inter actions between any pair of electronic systems, A and B, in states of arbitrary spin m ulti plicity and described bydoi:10.1098/rspa.1970.0126 fatcat:i65nabwvlzdjnc24sxz7emrlni