Faddeev Random Phase Approximation for molecules Original Research Article

The Faddeev Random Phase Approximation is a Greenʼs function technique that makes use of Faddeev-equations to couple two-particle–one-hole and two-hole–one-particle excitations to the single-particle spectrum. Solving these equations implies an infinite partial summation of the perturbation expansion of the self energy. This method goes beyond the third-order Algebraic Diagrammatic Approximation by treating both the particle–hole and particle–particle interactions at the Random Phase Approximation-level. This paper presents the first results of our calculations for diatomic molecules.