SEARCH Articles Figures Tables Brillouin-Wigner coupled-cluster theory Hilbert space approach Complete active space self-consistent fields coupled-cluster theory Coupled cluster method active space Coupled-cluster method Hilbert space approach Coupled-cluster theory Fock-space Energy level spacings, atomic clusters Fock space multireference coupled-cluster Fock space multireference coupled-cluster method Fock-Space Coupled Cluster Fock-Space Coupled Cluster Approach Fock-space coupled cluster method Fock-space coupled cluster method equations Fock-space coupled cluster method ionization potentials Fock-space multireference coupled cluster theory Free space clusters Full Cluster Expansion Theories in Fock Space Full Cluster Expansion Theories in Hilbert Space Hilbert space approach, multi-root coupled cluster Hilbert space approach, single-root coupled cluster Phase-space transition states atomic clusters Reactivity space approach cluster Single-root multi-reference Brillouin-Wigner coupled cluster theory Hilbert space approach