Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 130, Issue 11, Pages -Publisher
AMER INST PHYSICS
DOI: 10.1063/1.3089302
Keywords
carbon compounds; configuration interactions; coupled cluster calculations; fluorine; nitrogen; orbital calculations; SCF calculations; water; wave functions
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC)
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The state specific equation of motion coupled cluster (SS-EOMCC) method is an internally contracted multireference approach, applicable to both ground and excited states. Attractive features of the method are as follows: (1) the SS-EOMCC wave function is qualitatively correct and rigorously spin adapted, (2) both orbitals and dynamical correlation are optimized for the target state, (3) nondynamical correlation and differential orbital relaxation effects are taken care of by a diagonalization of the transformed Hamiltonian in the multireference configuration-interaction singles space, (4) only one- and two-particle density matrices of a complete-active-space self-consistent-field reference state are needed to define equations for the cluster amplitudes, and (5) the method is invariant with respect to orbital rotations in core, active, and virtual subspaces. Prior applications focused on biradical-like systems, in which only one extra orbital is needed to construct the active space, and similarly, single bond breaking processes. In this paper, the applicability of the method is extended to systems of general active spaces. Studies on F-2, H2O, CO, and N-2 are carried out to gauge its accuracy. The convergence strategy is discussed in detail.
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