Physics – Chemical Physics
Scientific paper
2007-04-12
Physics
Chemical Physics
Revised manuscript. The working equations of the Faddeev-RPA method are included in the Appendix
Scientific paper
10.1103/PhysRevA.76.052503
The spectral function of the closed-shell Neon atom is computed by expanding the electron self-energy through a set of Faddeev equations. This method describes the coupling of single-particle degrees of freedom with correlated two-electron, two-hole, and electron-hole pairs. The excitation spectra are obtained using the Random Phase Approximation, rather than the Tamm-Dancoff framework employed in the third-order algebraic diagrammatic contruction [ADC(3)] method. The difference between these two approaches is studied, as well as the interplay between ladder and ring diagrams in the self-energy. Satisfactory results are obtained for the ionization energies as well as the energy of the ground state with the Faddeev-RPA scheme that is also appropriate for the high-density electron gas.
Barbieri Carlo
Dickhoff W. H.
Neck Dimitri Van
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