## Application of Many-body Perturbation Theory to the Calculation of Auger Rates, Correlation Energies, and Photoioniziation Cross Sections |

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2p electrons affinity of oxygen atomic systems atomic units Auger rate Auger transition Bagus bound excited Chem Clementi continuum corr corr correlation energy Correlations3 denominator shifts diagrams of Fig dipole matrix element effects of diagrams electron affinity electron correlations estimate Exchange diagrams exchange interactions experimental fluorescence yield geometric series H.P. Kelly Hartree-Fock orbitals Higher order diagrams higher-order diagrams higher-order terms hole lines hole)-E Huzinaga imaginary included inner shell vacancy inner-shell electrons ionization energies K.A. Brueckner lowest order lowest-order result many-body perturbation theory many-body theory multiplets negative ion neon atom neutral oxygen obtain per-cent perturbation expansion photodetachment cross section photoionization cross section Phys polarizabi1ity position and width potential of Eq previously radiative rate resonance effects second-order shifted denominator shown in Fig Silverstone single excitation diagrams single-particle energy subshell summed geometrically Table third-order three-body diagrams Three-body contributions threshold to 12.5 total correlation two-body velocity form wavefunction