Journal
JOURNAL OF CHEMICAL PHYSICS
Volume 118, Issue 3, Pages 1128-1136Publisher
AMER INST PHYSICS
DOI: 10.1063/1.1527013
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The equation-of-motion (EOM) coupled cluster (CC) method with full inclusion of the connected triple excitations for ionization energies has been formulated and implemented. Using proper factorization of the three- and four-body parts of the effective Hamiltonian, an efficient computational procedure has been proposed for IP-EOM-CCSDT which at the EOM level requires no-higher-than n(occ)(3)n(vir)(4) scaling. The method is calibrated by the evaluation of the valence vertical ionization potentials for CO, N-2, and F-2 molecules for several basis sets up to 160 basis functions. At the basis set limit, errors vary from 0.0 to 0.2 eV, compared to experimental vertical ionization potentials. (C) 2003 American Institute of Physics.
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