Active-space DEA-EOMCCSDT(4p-2h) and DIP-EOMCCSDT(4h-2p) methods recover full parent results for methylene, trimethylenemethane, and 23 atoms/molecules at reduced cost.
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Double Electron Attachment and Double Ionization Potential Equation-of-Motion Coupled-Cluster Approaches with Full and Active-Space Treatments of 4-Particle-2-Hole and 4-Hole-2-Particle Excitations and Three-Body Clusters
Active-space DEA-EOMCCSDT(4p-2h) and DIP-EOMCCSDT(4h-2p) methods recover full parent results for methylene, trimethylenemethane, and 23 atoms/molecules at reduced cost.