Use of Propagators in the Hückel Model

Abstract
The electronic structures of molecules composed of identical atoms are investigated in terms of propagators under the Hückel approximation. General rules to get propagators for systems under considerations are presented. Then some physical quantities (the charge densities, the bond orders and the total energies) are obtained by making the analysis of the propagators. Expressions for the mutual polarizabilities are also exactly derived. Some discussions about the approximate natures of current results are made.