John F. Stanton

TL;DR: In this paper, a comprehensive overview of the equation of motion coupled-cluster (EOM•CC) method and its application to molecular systems is presented by exploiting the biorthogonal nature of the theory, it is shown that excited state properties and transition strengths can be evaluated via a generalized expectation value approach that incorporates both the bra and ket state wave functions.

TL;DR: The results strongly indicate that even greater accuracy may be expected in reactions that preserve (either exactly or approximately) the number and types of chemical bonds.

TL;DR: The theory for analytic energy derivatives of excited electronic states described by the equation-of-motion coupled cluster (EOM•CC) method has been generalized to treat cases in which reference and final states differ in the number of electrons as discussed by the authors.

TL;DR: The CCSD(T) method was originally motivated as an attempt to treat the effects of triply excited determinants upon both single and double excitation operators on an equal footing as mentioned in this paper.

TL;DR: ACES II as discussed by the authors is a new program system for ab initio electronic structure calculations, which involves the use of many-body perturbation theory (MBPT) and coupled-cluster (CC) theory for calculating the energy, geometry, spectra, and properties of small-to medium-sized molecules.