Coupled cluster CCSD(T)

Layer 2 — Chemistryin the quantum-chemistry subtree

Size-consistent correlated post-HF method with exponential Ansatz e^T|HF⟩. CCSD(T) 'gold standard' for single-reference chemistry; scales O(N⁷). Benchmarks for main-group thermochemistry (~1 kcal/mol).

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