PASPT2 is a linearized partial-active-space multi-state MRPT2 derived from IN-GMS-SU-CCSD that is strictly size-extensive and size-consistent via a special reference-specific zeroth-order Hamiltonian.
Quasi-degenerate extension of local N-electron valence state perturbation theory with pair-natural orbital method based on localized virtual molecular orbitals
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PASPT2: a size-extensive and size-consistent partial-active-space multi-state multi-reference second-order perturbation theory for strongly correlated electrons
PASPT2 is a linearized partial-active-space multi-state MRPT2 derived from IN-GMS-SU-CCSD that is strictly size-extensive and size-consistent via a special reference-specific zeroth-order Hamiltonian.