SEARCH Articles Figures Tables Cluster operator Cluster operator Cluster operator diagrams Cluster operator different Cluster operator expansion Cluster operator single Clustering Criteria Operator Commutation relations cluster operators Couple cluster methods wave operators Coupled cluster formalisms effective operators Coupled cluster operator Coupled cluster theory particle excitation operator Density operator cluster expansion Excitation operators coupled-cluster Exponentiated cluster operators Molecular clusters with one symmetry operator Operation cluster Operation cluster ordering Perturbational Decomposition of the Cluster Operators Single-orbital cluster operators Valence universal cluster operator Wave and cluster operators