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The equation-of-motion coupled cluster (EOM-CC) method is an approach to computing the properties of excited states (e.g. excitation energies, oscillator strengths, etc.)1) The central quantity in the EOM-CC method is the similarity-transformed Hamiltonian,
where T is the usual cluster operator. If this (non-Hermitian) operator is used as an approximate Hamiltonian in the Schrödinger equation and the excited-state wave function is written as a linear combination