Putting PASPT2 on a Firmer Basis

The recently proposed partial-active-space (PAS) multistate second-order perturbation theory (PASPT2) [Precision Chemistry 4, 997 (2026)] features connected amplitudes and a connected and closed intermediate Hamiltonian. Despite these hallmarks, PASPT2 (denoted as PASPT2H from now on) is not strictly size-extensive, as originally thought (and numerically confirmed), albeit strictly size-consistent. Nevertheless, PASPT2 is near-extensive for the states with major projections on the chosen PASM0. This becomes more transparent upon introducing PASPT2X, a strictly size-extensive variant. Compared with the intruder-prone PASPT2X, the intruder-free PASPT2H merely neglects second-order corrections that are important only for those states with major projections on the orthogonal complement RX of M0 within the closed space MX ( =M0⊕RX). Such states are usually not supported by the chosen finite one-particle basis set. The weak violation of size-extensivity is therefore numerically insignificant for the target states supported by M0, reinforcing the theoretical basis of PASPT2H.